WO2006038536A1 - 階調表現方法及び階調印刷物 - Google Patents
階調表現方法及び階調印刷物 Download PDFInfo
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- WO2006038536A1 WO2006038536A1 PCT/JP2005/018038 JP2005018038W WO2006038536A1 WO 2006038536 A1 WO2006038536 A1 WO 2006038536A1 JP 2005018038 W JP2005018038 W JP 2005018038W WO 2006038536 A1 WO2006038536 A1 WO 2006038536A1
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- gradation
- area ratio
- transmission
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/205—Ink jet for printing a discrete number of tones
- B41J2/2056—Ink jet for printing a discrete number of tones by ink density change
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J17/00—Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
- B41J17/36—Alarms, indicators, or feed-disabling devices responsible to material breakage or exhaustion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/205—Ink jet for printing a discrete number of tones
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/2803—Display of gradations
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/40087—Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two discrete brightnesses or optical densities, e.g. dots of grey and black inks on white paper
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
- H04N1/4058—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern with details for producing a halftone screen at an oblique angle
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/52—Circuits or arrangements for halftone screening
Definitions
- the present invention relates to an image gradation expression method and a gradation printed matter.
- a technique for expressing the gradation of a unit region by changing the area ratio of ink having a specific transmission density recorded in a predetermined unit region is already known.
- a technique for expressing the gradation of a unit area using a plurality of inks having different transmission densities for similar colors for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-324002
- an object of the present invention is to provide a gradation expression method and a gradation print that can express a wide gradation range with high quality.
- the present invention solves the above-described problems by the following method.
- the gradation expression method of the present invention is a gradation expression method for expressing gradation of the unit region by changing an area ratio of ink recorded per predetermined unit region, wherein the unit The first ink recorded with an area ratio of approximately 100% with respect to the area and the second ink with the area ratio changing are overlapped and recorded in the unit area, whereby the gradation of the unit area is recorded.
- the area ratio of the first ink is set to approximately 100% with respect to the unit area, and the area ratio of the second ink is changed according to the gradation to be expressed.
- the gradation of the unit area is expressed by overlapping recording.
- tone jumps that tend to occur in a high area ratio area in a gradation expression method using ink of a specific transparent density have a very large density change with respect to the area ratio change in the high area ratio area.
- the fact that printing unevenness easily occurs in a technique using a plurality of inks is caused by the occurrence of an ink non-formed part due to the positional deviation of the recorded ink, especially the positional deviation.
- the first ink and the second ink are recorded in the unit area as described above, the first ink is recorded in the unit area at an area ratio of approximately 100%. An unrecorded part does not occur in the area, and a stable gradation expression can be provided.
- grade in the present invention includes transmission density and reflection density. “Approximately 100%” is not necessarily exactly 100% as long as it is approximately 100%.
- the first ink and the second ink may be the same transmission density ink, or may be different transmission density inks.
- Either the first ink or the second ink may be recorded in the unit area first, or both inks may be recorded simultaneously.
- the first ink and the second ink may be inks having similar colors and different transmission densities. This makes it possible to adjust the degree of gradation change with respect to the area ratio change. If an ink having an appropriate density difference is selected, the gradation range power that needs to express gradation changes in detail in particular. The area ratio can be easily controlled regardless of other gradation ranges.
- the area ratio of the second ink may vary within a range of 0% to 90%.
- the inventor has found that it is difficult to control the area ratio particularly when the area ratio exceeds 90%. Therefore, this makes it possible to avoid the control of the area ratio in the range of more than 90% for the second ink, and to provide a gradation expression method that makes it easier to control the area ratio.
- the gradation of the unit region of the present invention is composed of a low density part, a medium density part, and a high density part from the lowest order, and among the inks having different densities, the density of the low density ink having a relatively low density.
- the gradation contained in the low density portion is expressed by the change in the area ratio, the low density ink is the first ink, the high density ink having a relatively high density is the second ink, and the medium density portion is Gradations are expressed, and the high density ink is used as the first ink, the low density ink is used as the second ink, and two inks are used to change the gradation of the unit area into the low density part. Can be expressed continuously.
- the first ink and the second ink such that a change in gradation at each boundary between the low density portion, the medium density portion, and the high density portion falls within a predetermined range.
- Each of the inks may be used.
- the inventor has found that the tone jump generated at the boundary between the density portions is caused by the transmission densities of the first ink and the second ink. Therefore, by selecting the first ink and the second ink having appropriate densities, it is possible to express gradations that change more continuously.
- the predetermined range for example, if the difference in transmission density at the boundary of each density part is 0.1 or less, a gradation image with almost no tone jump can be obtained.
- the gradation printed matter of the present invention is a gradation printed matter in which the gradation of the unit region is expressed by changing the area ratio of the ink printed per predetermined unit region.
- a first ink that is printed at an area ratio of approximately 100% with respect to the unit area and a second ink that changes in the area ratio are overlapped and printed on the unit area, thereby forming the unit area.
- the first ink printed at an area ratio of approximately 100% with respect to the unit area, and the second ink whose area ratio changes according to the gradation to be expressed by the unit area By overlaying and printing, it is possible to obtain a gradation printed matter in which the gradation of the unit area is expressed.
- the interpretation and printing method (recording method) for the first ink and the second ink, and the significance of the configuration as described above are as described above.
- the interpretation of “tone” and “approximately 100%” is also as described above.
- FIG. 1 is a diagram showing an example of a unit area in the present invention.
- FIG. 2 is a diagram showing a change in the area ratio of ink recorded in a unit region in a low density portion.
- FIG. 3 is a diagram showing a change in the area ratio of ink recorded in a unit area in a middle density portion.
- FIG. 4 is a diagram showing a change in the area ratio of ink recorded in a unit region in a high density portion.
- FIG. 5 A list of transmission densities by density for inks with different transmission densities.
- FIG. 6 is a graph showing changes in the area ratio of high-density ink and low-density ink in Example 1
- FIG. 7 is a graph showing changes in the area ratio of high-density ink and low-density ink in Example 2
- FIG. 8 is a graph showing changes in the area ratio of high-density ink and low-density ink in Example 3
- FIG. 9 is a graph showing changes in the area ratio of high-density ink and low-density ink in Example 4.
- FIG. 10 is a graph showing changes in the area ratio of high-density ink and low-density ink in Example 5
- FIG. 11 is a graph showing changes in the area ratio of high-density ink and low-density ink in Example 6
- FIG. 12 is a graph showing changes in the area ratio of high-density ink and low-density ink in Example 7
- FIG. 13 is a graph showing changes in the area ratio of low density ink in Example 8-1.
- FIG. 14 is a graph showing changes in the area ratio of medium density ink and low density ink in Example 8-2.
- FIG. 15 is a graph showing changes in the area ratio of medium density ink and high density ink in Example 8-3.
- FIG. 16 is a graph showing changes in the area ratio of high-density ink in Comparative Example 1.
- FIG. 17A is a graph showing an ideal gradation change by a gradation expression method in which high density ink and low density ink in Comparative Example 2 are used for recording without overlapping.
- FIG. 17B In the gradation expression method shown in FIG. The graph which shows the gradation change at the time of.
- FIG. 18A is a graph showing an ideal gradation change by a gradation expression method in which high density ink and low density ink in Comparative Example 3 are used for recording without overlapping.
- FIG. 18B is a graph showing gradation changes when ink recording is performed by shifting one dot in the gradation expression method shown in FIG. 18A.
- FIG. 1 is a diagram showing a unit area 1 in the present embodiment.
- the unit area 1 is one divided area obtained by dividing a gradation-represented image by a predetermined size. For example, when an image is printed using a printer, it corresponds to a pixel of the printer.
- a low density ink having a transmission density of 0.8 and a high density ink having a transmission density of 1.6 are used as inks having different transmission densities for similar colors, and a gradation of 0 to 2.4 is expressed. Will be described.
- the gradation is indicated by transmission density, sometimes referred to as “transmission density”.
- the dividing line attached to the grid of the unit region 1 square is provided for the convenience of the following explanation, and is not actually visible.
- FIGS. 2 to 4 are diagrams showing how the gradation of the unit region 1 is expressed by the two inks.
- the gradation expressed in the unit area 1 is divided into three areas of a low density part, a medium density part, and a high density part, and FIG. 1D
- FIG. 3 shows unit areas 1E to 1H expressing the gradation of the medium density part
- FIG. 4 shows unit areas 1I to 1L expressing the gradation of the high density part.
- unit area 1A ⁇ When it is not necessary to distinguish LL, it is simply called unit area 1.
- the second row shows that the low density ink is recorded in the unit area 1 with a predetermined area ratio
- the third stage is the unit area 1 with the high density ink having the predetermined area ratio.
- the first row shows the result of recording the second-tier low density ink and the third-tier high density ink overlaid on the unit area 1.
- the second area shows the unit area 1F-1 in which the low density ink is recorded at the area ratio of 100%
- the third stage shows the high density ink having the predetermined area ratio.
- the unit area 1F-2 recorded in a cross shape is shown, and the unit area 1F recorded by superimposing the second-stage low density ink and the third-stage high density ink on the first stage is shown.
- low density ink is applied to a coarse lattice.
- the pattern and high-density ink are shown in a fine grid pattern, and the state where the low-density ink and the high-density ink are overlapped and recorded is shown in black.
- the portion recorded in an overlapping manner will have a transmission density that takes into account the transmission density of both links.
- the recording result forms a gradation printed matter.
- the portion where the low density ink and the high density ink are overlapped and recorded is referred to as the gradation recording portion OC
- the portion excluding the overlapping recording portion ex is referred to as the solid recording portion ⁇ .
- the cross-shaped black portion is the gradation recording portion ⁇
- the other portion is the solid recording portion ⁇ .
- the transmission density of each recording result is arranged so as to increase from left to right.
- the unit region 1E force also increases in the area ratio of the gradation recording portion ⁇ toward the unit region 1H, and the transmission density increases from the unit region 1E toward the unit region 1H.
- a gradation expression method in each density part will be described.
- the low density portion as shown in FIG. 2, the high density ink is not recorded, and only the low density ink is recorded, whereby the transmission density of the recording result is expressed.
- the range of the transmission density that can be expressed by the low density part by such a method will be described later. Since the high density ink is not recorded in the low density portion, the portion where only the low density ink is recorded is the gradation recording portion ⁇ , and the unrecorded portion is the solid recording portion j8.
- the low density ink is always recorded as the first ink at an area ratio of approximately 100%, and the high density ink is expressed as the second ink at the gradation to be expressed. Accordingly, the area ratio is changed and recorded.
- the range of transmission density that can be expressed by the medium density part by such a method will be described later.
- the high density ink is always recorded as the first ink at an area ratio of 100%, and the low density ink is used as the second ink according to the gradation to be expressed. It is recorded by changing the area ratio.
- the transmission density that can express the high density part by such a method will be described later.
- the area ratio of one region is SO and the transmission density is D0
- the area ratio of the other region is S1
- the transmission density is D1.
- the transmittance T S0X10—D0 + S1X10—D1 holds.
- the transmission density in the predetermined range is calculated and predicted by the following formula A, and the consistency with the actually measured values is examined. It is confirmed that the formula A holds.
- Equation ⁇ is obtained from Equation A above, where the area ratio of the gradation recording portion oc is S, the area ratio of the solid recording portion ⁇ is 1 S, and the transmission densities are Dl and DO, respectively.
- Equation ⁇ becomes Equation C especially in the low concentration region.
- the solid recording portion ⁇ in the middle density portion is a portion where the low density ink is recorded
- the transmission density DO is 0.8
- the gradation recording portion ⁇ has the high density ink and the low density ink. Since the overlapping recording is performed, the transmission density D1 of the gradation recording part ex is 2.4, which is the transmission density of the high density ink + the transmission density of the low density ink. Therefore, Equation ⁇ becomes Equation D, especially in the middle concentration area.
- the transmission density DO is 1.6
- the gradation recording part ⁇ has high density ink and low density ink. As described above, it is 2.4 because it is a part that is recorded in duplicate. Therefore, equation ⁇ becomes equation ⁇ ⁇ especially in high-concentration areas.
- the change in the area ratio S of the gradation recording portion a can be changed in the range of 0% to: LOO%, as described above, it is difficult to control the area ratio if it exceeds 90%. Therefore, the upper limit value of the area ratio S should be about 95%, preferably about 90%.
- the range of transmission density that can be expressed in each density part is as follows.
- the “low density ink OD setting” column indicates the transmission density set as the low density ink
- the “high density ink OD setting” column indicates the transmission density set as the high density ink.
- the column “Lower limit OD” in the low density area is the range of transmission density that can be expressed as the low density area. It is obtained by setting S of C to 0.
- the “Upper limit OD” column is the upper limit of the range of the transparent concentration that can be expressed as the low concentration part, and is obtained by setting S in Formula C to 0.9.
- the upper and lower limits can be obtained by performing the same process as for the low concentration part according to Equation D for the medium concentration part and Equation E for the high concentration part.
- the upper limit OD of the low density part and the lower limit OD of the middle density part are There is a difference of 0.6, and a tone jump occurs when moving from the low density area to the middle density area.
- the high density ink OD setting is 2.3 and the low density ink OD setting is 0.8, there is a difference between the upper limit OD of the medium density part and the lower limit OD of the high density part of 0.6. Tone jump occurs when moving from high to high concentration.
- the density difference at the boundary of the density part is preferably 0.1 or less.
- the transmission density of the first ink and the second ink in Yellow is both 0.5, the low density part is expressed by gradation by area ratio modulation of the first ink, and the high density part is approximately 100%.
- gradation is expressed by area ratio modulation of the first ink 1 layer and the second ink recorded by area ratio.
- one layer of ink means a state where ink is recorded once in a predetermined area at approximately 100%, and hereinafter, ink two layers, three layers depending on the number of times of recording approximately 100%. That's it.
- the transmission density of the first ink in magenta is 0.5
- the transmission density of the second ink is 1.0
- the low density portion is expressed by gradation by area ratio modulation of the first ink.
- the density portion is expressed by gradation by area ratio modulation of the first ink 1 layer and the second ink recorded at an area ratio of approximately 100%.
- the area ratio S changes from 0% ⁇ S ⁇ 95%
- the maximum transmission density in the low density area is 0.46.
- DO 0.0
- SO 0.05
- D1 0.5
- SI 0.95 into the equation ⁇ .
- the transmission density of the first ink in cyan is 0.6
- the transmission density of the second ink is 1.2
- the low density part is expressed by gradation by the area ratio modulation of the first ink.
- the first part of the first ink recorded at an area ratio of approximately 100% is represented by gradation using the area ratio modulation of the first ink layer and the first ink
- the high density part is recorded at an area ratio of approximately 100%.
- gradation is expressed by the area ratio modulation of the two ink layers or the second ink layer 1 and the second ink layer.
- the transmission density difference is 0.1 or less, the gradation difference is sufficiently small, so that a gradation image with almost no tone jump can be obtained at the boundary of each density portion. Furthermore, a desired total of two layers of the first ink and two layers of the first ink recorded at an area ratio of approximately 100%, or two layers of the second ink recorded at an area ratio of approximately 100%. A maximum transmission density of 2.4 can be obtained. Therefore, it can be determined that an ink having a transmission density of 0.6 as the first ink and an ink having a transmission density of 1.2 as the second ink are appropriate in the cyan gradation expression method.
- the present invention is not limited to the above embodiment, and may be implemented in various forms.
- the predetermined unit area may be a predetermined range obtained by dividing the image, such as a circle or a triangle, which need not be rectangular.
- the shape to be recorded is not particularly limited as long as the ink is recorded according to a predetermined area ratio which is not necessarily rectangular.
- For the first ink and the second ink use inks with the same transmission density that do not have different transmission densities.
- the change in the area ratio of each ink with respect to the transmission density obtained in this manner is shown in graph 20 in FIG.
- the horizontal axis represents the transmission density of the recording result
- the vertical axis represents the ink area ratio
- “Low” represents the change in the area ratio of the low density ink
- “High” represents the change in the area ratio of the high density ink.
- the way to read the graph is the same in the following graphs.
- Graph 20 shows that the area ratio changes while maintaining a certain slope with respect to the change in transmission density.
- the range of gradation change in the recording results was set from 0 to 2.0, and the transmission densities of the high density ink and the low density ink were the same and were set as follows.
- the ink used in this example is simply referred to as ink.
- the ink area ratio was changed so that the transmission density of the recorded result changed to 2.0 every 0.0 force 0.2. First, the ink area ratio is recorded in accordance with the transmission density to be expressed, and then the area ratio is 100% ink and the ink with the area ratio changed according to the transmission density to be expressed is overlaid. Recorded.
- the change in the area ratio with respect to the reflection density was measured in the same manner as in Example 2 except that the transmission density of the high density ink and the transmission density of the low density ink were set to the values shown below.
- the change in area ratio with respect to the reflection density is shown in graph 60 in FIG.
- Graph 60 draws a curve similar to graph 30 for transmission density. Therefore, in the reflection density as well as the transmission density, the area ratio changes while maintaining a certain slope with respect to the change in density.
- the change in the area ratio with respect to the reflection density was measured in the same manner as in Example 4 except that the transmission density of the high density ink and the transmission density of the low density ink were set to the following values.
- the change in area ratio with respect to the reflection density is shown in graph 70 in FIG.
- Graph 70 shows the transmission density.
- the difference in ink transmission density is small! From exceeding twice the density of low density ink to twice the density of high density ink. In the range, the change of the area ratio with respect to the gradation change becomes large.
- the change in the area ratio with respect to the reflection density was measured in the same manner as in Example 1 except that the transmission density of the high density ink and the transmission density of the low density ink were set to the following values.
- the change in the area ratio with respect to the reflection density is shown in the graph 80 of FIG.
- Graph 80 draws a curve similar to graph 20 for transmission density. Therefore, in the reflection density as well as the transmission density, the area ratio changes while maintaining a certain slope with respect to the change in density.
- the range of gradation change in the recording results was set to 0 to 1.2 especially in the low density part, and low density ink with a transparent density of 0.6 was used.
- the recording density of the low-density ink is changed from 0 according to the transmission density to be expressed so that the transmission density of the recording result changes from 0.0 force to 0.1 every 0.1.
- the portion having a transmission density of 0.6 or more was recorded with a low density ink having an area ratio of 100% and a low density ink in which the area ratio was changed according to the transmission density to be expressed.
- the graph 90-1 in Fig. 13 shows the transmission density results of the recording results obtained in this way. Both of the two graphs shown in Graph 90-1 show the change in the area ratio of low-density ink.
- the area ratio of the low density ink changes gradually in the range of gradation 0.0 to 1.2.
- Example 8-2 Recording was performed in the following manner using low density ink and medium density ink.
- the range of gradation change in the recorded results was set to 1.2 to 1.8 in the middle density part, and medium density ink with a transmission density of 1.2 and low density ink with a transparent density of 0.6 were used.
- the graph 90-2 in Fig. 14 shows the transmission density results of the recording results obtained in this way. “Low” indicates the change in the area ratio of the low density ink, and “Mid” indicates the change in the area ratio of the medium density ink.
- Gradation 1.2 The area ratio of low density ink changes gradually in the range of 2 to 1.8.
- the range of gradation change in the recording results was set to 1.8 to 3.0, especially in the high density area, and high density ink with a transmission density of 1.8 and medium density ink with a transmission density of 1.2 were used.
- a medium density ink that changes the area ratio according to the density that should be expressed as a high density ink with an area ratio of 100% so that the transmission density of the recorded result changes from 1.8 to 3.0 every 0.1. was recorded in layers.
- the graph 90-3 in Fig. 15 shows the transmission density results of the recording results obtained in this way. “High” indicates a change in the area ratio of high density ink, and “Mid” indicates a change in the area ratio of medium density ink. Gradation 1. The area ratio of medium density ink changes gradually in the range from 1.8 to 3.0.
- a graph 110 in FIG. 17A shows an ideal gradation change.
- a graph 120 in FIG. 17B shows how the gradation changes when the ink recording is recorded with a shift of one dot according to the change in the area ratio.
- the change in the area ratio is the transmission density of the recorded result.
- the change in the transmission density is larger than the range of the transmission density of 1.0 to 2.0. It is not uniform. Therefore, the gradation expression method that prevents the two inks from overlapping does not provide the intended gradation change just by shifting the recording position by one dot.
- gradation change is ideally expressed by changing the area ratio so that it does not overlap each other and the sum of the area ratios is 100%. This is shown in graph 130 of FIG. 18A.
- Graph 140 in FIG. 18B shows how the gradation changes when ink recording is recorded with a shift of one dot in accordance with the change in area ratio.
- the change in the area ratio is the transmission density of the recorded result.
- the change in the transmission density is greater than the range of the transmission density of 0.8 to 1.2. It is not uniform.
- the change in transmission density is not proportional to the change in area ratio. Therefore, as in Comparative Example 2, the gradation expression method in which two inks are not overlapped cannot obtain the intended gradation change only by shifting the recording position by one dot.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Plasma & Fusion (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Discrete Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Color, Gradation (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05788225A EP1808300A4 (en) | 2004-10-01 | 2005-09-29 | GRADING REPRESENTATION METHOD AND GRADING PRINTING |
US11/576,369 US20070291064A1 (en) | 2004-10-01 | 2005-09-29 | Gradation Representing Method And Gradation Printer Matter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004290085A JP2006103043A (ja) | 2004-10-01 | 2004-10-01 | 階調表現方法及び階調印刷物 |
JP2004-290085 | 2004-10-01 |
Publications (1)
Publication Number | Publication Date |
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WO2006038536A1 true WO2006038536A1 (ja) | 2006-04-13 |
Family
ID=36142612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/018038 WO2006038536A1 (ja) | 2004-10-01 | 2005-09-29 | 階調表現方法及び階調印刷物 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070291064A1 (ja) |
EP (1) | EP1808300A4 (ja) |
JP (1) | JP2006103043A (ja) |
KR (1) | KR20070072558A (ja) |
CN (1) | CN101031430A (ja) |
WO (1) | WO2006038536A1 (ja) |
Families Citing this family (1)
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JP5098540B2 (ja) * | 2007-09-28 | 2012-12-12 | 大日本印刷株式会社 | 熱転写記録装置及び熱転写記録方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06270421A (ja) * | 1993-03-19 | 1994-09-27 | Canon Inc | 記録方法および記録装置 |
JPH11115222A (ja) * | 1997-10-16 | 1999-04-27 | Seiko Epson Corp | 複数種類の階調再現サブモードを用いたドット記録方法および装置、並びに、その処理を実行するためのプログラムを記録した記録媒体 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4686538A (en) * | 1984-10-31 | 1987-08-11 | Canon Kabushiki Kaisha | Tone recording method |
JPS62133864A (ja) * | 1985-12-05 | 1987-06-17 | Minolta Camera Co Ltd | カラ−画像再現用原稿の作成装置及び方法 |
JPH09164705A (ja) * | 1995-12-14 | 1997-06-24 | Mitsubishi Electric Corp | インクジェット記録装置 |
JP3281247B2 (ja) * | 1995-12-29 | 2002-05-13 | キヤノン株式会社 | インクジェット記録装置 |
US6439682B1 (en) * | 1998-03-05 | 2002-08-27 | Seiko Epson Corporation | Printing method, printing apparatus, and recording medium |
US6786571B2 (en) * | 2000-03-31 | 2004-09-07 | Seiko Epson Corporation | Ink set comprising dark yellow ink composition |
JP4236804B2 (ja) * | 2000-09-29 | 2009-03-11 | 富士通株式会社 | 画像処理方法、その装置及び記憶媒体 |
JP4078811B2 (ja) * | 2001-03-30 | 2008-04-23 | セイコーエプソン株式会社 | 画素ブロック単位で濃淡インクによる階調再現を行う印刷 |
JP2003127438A (ja) * | 2001-10-24 | 2003-05-08 | Seiko Epson Corp | 印刷制御装置、印刷制御方法、印刷制御プログラム、印刷制御プログラムを記録した媒体、印刷装置、印刷方法 |
US6783203B2 (en) * | 2001-05-11 | 2004-08-31 | Seiko Epson Corporation | Printing with multiple pixels as unit of gradation reproduction |
JP2003145738A (ja) * | 2001-11-13 | 2003-05-21 | Seiko Epson Corp | 印刷制御装置、印刷制御方法および印刷制御プログラムを記録した媒体 |
JP4396137B2 (ja) * | 2003-05-22 | 2010-01-13 | セイコーエプソン株式会社 | 液体吐出装置、液体吐出方法、および液体吐出システム |
-
2004
- 2004-10-01 JP JP2004290085A patent/JP2006103043A/ja active Pending
-
2005
- 2005-09-29 KR KR1020077009779A patent/KR20070072558A/ko not_active Application Discontinuation
- 2005-09-29 WO PCT/JP2005/018038 patent/WO2006038536A1/ja active Application Filing
- 2005-09-29 US US11/576,369 patent/US20070291064A1/en not_active Abandoned
- 2005-09-29 EP EP05788225A patent/EP1808300A4/en not_active Withdrawn
- 2005-09-29 CN CNA2005800333598A patent/CN101031430A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06270421A (ja) * | 1993-03-19 | 1994-09-27 | Canon Inc | 記録方法および記録装置 |
JPH11115222A (ja) * | 1997-10-16 | 1999-04-27 | Seiko Epson Corp | 複数種類の階調再現サブモードを用いたドット記録方法および装置、並びに、その処理を実行するためのプログラムを記録した記録媒体 |
Non-Patent Citations (1)
Title |
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See also references of EP1808300A4 * |
Also Published As
Publication number | Publication date |
---|---|
KR20070072558A (ko) | 2007-07-04 |
EP1808300A4 (en) | 2011-06-15 |
JP2006103043A (ja) | 2006-04-20 |
US20070291064A1 (en) | 2007-12-20 |
CN101031430A (zh) | 2007-09-05 |
EP1808300A1 (en) | 2007-07-18 |
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