WO2017159460A1 - 色補正テーブル作成方法、色補正テーブル作成装置、プログラム - Google Patents
色補正テーブル作成方法、色補正テーブル作成装置、プログラム Download PDFInfo
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- WO2017159460A1 WO2017159460A1 PCT/JP2017/009033 JP2017009033W WO2017159460A1 WO 2017159460 A1 WO2017159460 A1 WO 2017159460A1 JP 2017009033 W JP2017009033 W JP 2017009033W WO 2017159460 A1 WO2017159460 A1 WO 2017159460A1
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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
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
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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
- B41J2/525—Arrangement for multi-colour printing, not covered by group B41J2/21, e.g. applicable to two or more kinds of printing or marking process
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
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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
- H04N1/46—Colour picture communication systems
-
- 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
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6002—Corrections within particular colour systems
- H04N1/6008—Corrections within particular colour systems with primary colour signals, e.g. RGB or CMY(K)
Definitions
- the present invention relates to the creation of a color correction table.
- Patent Document 1 discloses a method of creating a color correction table according to the following procedure. First, as a first procedure, a predetermined color patch is printed based on patch image data for printing a plurality of patches in which gradation values are changed for each ink color used in the printing apparatus.
- the printed color patch is measured to obtain the color value of the same color patch.
- the color values corresponding to all tone values of the color correction table are interpolated and obtained using a predetermined function with reference to the obtained color values.
- the color value corresponding to the whole tone value acquired by the above-mentioned interpolation is compared with the standard value which is the color value of the standard print result, and based on the comparison result, any tone value is selected.
- a color correction table for correcting the same color image data so as to obtain a print result equivalent to the standard print result corresponding to the color image data by the printing apparatus is created.
- a color correction table is created independently for each ink color to be used. In this case, the correction of the error in the mixed color area may not be sufficient. Further, even in the mixed color region, when it is intended to interpolate the colorimetric result as in the above-mentioned prior art, it is necessary to increase the colorimetric number exponentially with respect to the colorimetric number in the case of single colorimetry. For example, the same degree of interpolation accuracy can not be expected.
- the present invention is for solving the above-mentioned subject, and can be realized as the following modes.
- One embodiment of the present invention is a color correction table creation method for creating a color correction table for correcting a device dependent value as print data input to a printing device, and inputting a predetermined device dependent value to the printing device
- An output value acquiring procedure for acquiring, as an output value, a colorimetric result of the printed matter created by the device; and a device dependent value for realizing the acquired output value by the printed matter created by the reference printing device;
- a color correction table generation method including: a generation procedure of generating the color correction table by using; According to this aspect, even if the number of colors is small, the relationship between the input value and the correction value is highly accurate.
- the correction value is a value input in the output value acquisition procedure, no error occurs.
- the input value does not include much error because the characteristic of the reference printing apparatus is used in the input value acquisition procedure.
- the characteristics of the reference printing device can be predetermined for a number of combinations. Therefore, even if interpolation or the like is performed, the error can be reduced because it can be performed with high accuracy.
- the method further includes a complementing procedure for complementing the relationship between the input value and the correction value; in the creating procedure, at least a part of the input value to be stored in the color correction table is complemented The result may be used to determine the correction value.
- the color correction table can be created with high accuracy even with a small number of colors.
- a spline function may be used in the complement procedure. According to this aspect, it is possible to create the color correction table with higher accuracy by using the spline function.
- the input value may be determined such that a sum of squares of quadratic differential parameters at each lattice point of the cubic spline function used in the complementing procedure is minimized. According to this aspect, since the input value to be determined becomes smooth, the correction accuracy is improved.
- the cubic spline function used in the complementing procedure includes first to nth (n is an integer of 2 or more) spline functions defined by first to nth orthogonal directions, respectively; A second derivative parameter at a lattice point of a spline function in a direction of an m-th (m is an arbitrary integer of 1 to n) and adjacent to the lattice point in a direction orthogonal to the m-th direction.
- the input value may be determined so as to minimize the value calculated and summed into. According to this aspect, since the input values in the adjacent directions approximate each other, the correction accuracy is improved.
- the device dependent value as the print data is defined in n (n is an integer of 2 or more) dimensions; in the input value acquiring procedure, among the candidates of the input value, in the n-dimensional space A value with which the distance to the predetermined device dependent value is shortest may be acquired as the input value. According to this aspect, it is possible to suppress that the value is largely changed before and after the correction.
- the method further includes a colorimetric device correction procedure for correcting a deviation between a characteristic of the color measurement device used for color measurement of the printed matter in the input value acquisition procedure and a characteristic of the reference color measurement device;
- the input value may be acquired using the correspondence between the device dependent value acquired in the colorimetric device correction procedure and the output value. According to this aspect, the error of the color measurement device can also be corrected.
- the present invention can be realized in various forms other than the above.
- the present invention can be realized in the form of an apparatus for realizing the above method, a program therefor, a non-temporary storage medium storing the program, or the like.
- FIG. 1 is a block diagram illustrating a printing system.
- 6 is a flowchart showing color image data correction processing.
- 6 is a flowchart showing color correction table creation processing.
- a graph showing the relationship between output values and device dependent values. Graph to explain the complementation procedure of missing data.
- Expression (6) representing the matrix B.
- the graph which shows the relationship between an output value and a device dependence value (Embodiment 2).
- FIG. 6 is a diagram showing a color value space that can be reproduced for each grid point of K values.
- 6 is a flowchart showing color image data correction processing (third embodiment).
- 6 is a flowchart showing colorimetry device correction processing.
- FIG. 1 is a block diagram showing a printing system 50. As shown in FIG.
- the printing system 50 includes a color image data correction device 20 (hereinafter, referred to as a correction device 20) and a printing device 30.
- the printing apparatus 30 executes printing in accordance with multi-tone color image data as input color image data.
- Multi-tone color image data is represented by device dependent values. Specifically, C (cyan), Y (yellow), M (magenta) and K (black) values (0 to 255) are used. It is described by a combination. One color value represented by these four combinations constitutes one device dependent value.
- the printing device 30 includes a color measurement device 35.
- the color measurement device 35 can measure the printed matter produced by the printing device 30 and the printed matter produced by another printing device.
- the colorimetric result is a color value in the Lab color space.
- the printing device 30 inputs the measurement result to the correction device 20.
- the correction device 20 is a computer including an arithmetic unit (CPU), a storage device (ROM, RAM, HDD, memory, etc.), an input / output interface, and the like.
- the correction device 20 corrects color image data to be printed, and then inputs the color image data to the printing device 30.
- Multi-tone color image data is represented by device dependent values. Specifically, C (cyan), Y (yellow), M (magenta) and K (black) values (0 to 255) are used. It is described by a combination.
- the color correction table 22 is used for the above correction.
- the color correction table 22 is a LUT (look-up table) created one by one for each of the printing apparatuses 30 using processing described later. Therefore, the correction device 20 is also a device (correction table generation device) for generating the color correction table 22.
- the correction device 20 stores an A2B table 25 which is defined as an ICC profile and describes device characteristics in order to create the color correction table 22.
- FIG. 2 shows the A2B table 25.
- Each device dependent value is associated with a color value (device independent value) represented by a device independent color space.
- the device-independent color space is the Lab color space in this embodiment.
- the correspondence in the A2B table 25 is a relation obtained by the reference printing apparatus.
- the reference printing apparatus is an individual printing apparatus different from the printing apparatus 30, and has a reference characteristic. That is, when the reference printing apparatus measures the patch printed by a certain device dependent value using the color measuring device provided in the reference printing apparatus, L *, a *, b * associated with the device dependent value Each value of is measured.
- the A2B table 25 describes combinations of a large number of device dependent values and device independent values.
- a large number means that the number is a large number compared to the number of combinations of device-dependent values and device-independent values (colorimetry values) acquired in S220 described later.
- FIG. 3 is a flowchart showing color image data correction processing.
- the correction device 20 implements color image data correction processing by executing a program stored in a storage medium.
- color correction table creation processing is executed (S200).
- FIG. 4 is a flowchart showing color correction table creation processing.
- a predetermined device dependent value is input to the printing apparatus 30 (S210).
- S210 the printing apparatus 30
- the combination of the device dependent value and the colorimetric value is acquired from the printing apparatus 30 (S220) (output value acquisition procedure).
- the printing apparatus 30 prints patches of each color using the device dependent value input in S210.
- the printing device 30 measures each patch by the color measurement device 35 and inputs the colorimetric value to the correction device 20.
- the input colorimetric value is associated with the device dependent value that is the source of printing of the patch.
- S220 is performed.
- S230 input value acquisition procedure
- S240 correction value acquisition procedure
- FIG. 5 is a graph showing the relationship between the output value (color value of device independent value) and the device dependent value.
- the Lab color space that is three-dimensional and the device dependent value that is four-dimensional are treated as one-dimensional.
- the measurement points (b i , Lab i ) shown in FIG. 5 are one of the correspondences obtained in S220. That is, when the color measurement device 35 measures the color of the printed matter printed by the printing device 30 according to the device dependent value b i , it indicates that the result is the output value Lab i .
- FIG. 5 the relationship T1 defined in the A2B table 25 is shown.
- the measurement points shown in FIG. 5 deviate from the relationship defined in the A2B table 25. That is, the printing by the printing apparatus 30 causes a color shift.
- the value of the horizontal axis at the intersection between the output value Lab i relationship T1 is a device dependent values b 'i. That is, in the A2B table, the device dependent value b ′ i and the output value Lab i are stored in association with each other. Therefore, when it is desired to obtain a print result by the output value Lab i using the printing device 30, the device dependent value b i may be input to the printing device 30 instead of the device dependent value b ′ i .
- the device dependent value obtained from the colorimetric result and the relation T1 as described above will be referred to as an input value. That is, a device dependent value for realizing the output value acquired in S220 by the printed material generated by the reference printing apparatus is acquired as an input value in the color correction table 22.
- the device dependent value input in S210 as a value corresponding to the acquired input value is referred to as a correction value.
- Correction values corresponding to the input value b 'i would that the correction value b i.
- the input values of the table corresponding to the A2B table defining the color values to be targeted is a method of determining the correction value a i 'corresponding to a i.
- the correction value is determined by interpolation using the relationship between the value input in step S210 and the colorimetric value acquired in step S220, but the realistic number of color measurement points corresponds to the color mixture. Accurate interpolation for color correction is difficult.
- the missing data (the relationship between the input value and the correction value) is determined (S250) (complementary procedure).
- the missing data refers to the correspondence between the input value that could not be acquired in S240 (correction value acquisition procedure) and the correction value among the storage targets of the color correction table 22.
- FIG. 6 is a graph for explaining a complementing procedure for determining missing data.
- the vertical axis in FIG. 6 is the input value, and the horizontal axis is the correction value.
- the correction value b i as the measurement point and the input value b ′ i is known, it is given as the initial value.
- the correction value b 0 and the correction value b n-1 are given to the input value b ' 0 and the input value b' n-1 which are end points.
- the correction value b 0 is equal to the input value b ′ 0
- the correction value b n ⁇ 1 is equal to the input value b ′ n ⁇ 1 .
- the above complementation procedure determines missing data using a cubic spline function (hereinafter simply referred to as "spline function").
- the independent variable x of the spline function is the correction value
- the dependent variable y is the input value
- the data constituting the spline function complements the missing data by determining to satisfy the following two conditions. The first is to go through the points already determined. That is, it passes through (b 0 , b ′ 0 ), (b i , b ′ i ) and (b n ⁇ 1 , b ′ n ⁇ 1 ). The second condition is that the sum of squares of the second derivative parameter y "of the input value (dependent variable) at each correction value (independent variable) is minimized.
- this supplementary condition does not necessarily have to be zero because the second derivative parameter y "does not necessarily have to be zero, it is most common to set it to zero. Is determined, the correspondence between all the input values and the correction value is determined.
- the vector y is a vector having the dependent variable as an element.
- the vector y ′ has elements corresponding to the second derivative as elements, and the number of elements is n ⁇ 2.
- the matrix A is as follows.
- the matrix B is shown in FIG.
- the matrix A is an n-2 row x n-2 column tridiagonal matrix.
- the matrix B is an n-2 row ⁇ n column and not a square matrix, but is a matrix having a structure similar to a tridiagonal.
- Equation (2) can be rewritten as equation (7).
- y " A -1 B u y u + A -1 B k y k (7)
- the spline function is defined in only one direction, that is, one-dimensional.
- the input values and the correction values are CMYK four dimensions.
- the objective function can be generated by defining equation (8) for each direction and adding them together.
- the above-mentioned objective function is defined by the equation (8) defined correspondingly. Add also.
- the data of the color correction table 22 complemented in this way is (b 1 , b ′ 1 ),..., (B i ⁇ 1 , b ′ i ⁇ 1 ), (b i + 1 , b ′ i + 1 ) in FIG. ,..., (B n ⁇ 2 , b ′ n ⁇ 2 ).
- the color correction table 22 is created using the result of S250 (S260) (creation procedure).
- FIG. 8 shows the color correction table 22.
- color image data is corrected using the created color correction table 22 (S500). That is, the input value is corrected to the correction value by using the CMYK value as color image data input to the correction device 20 as the input value and acquiring the CYMK value as the correction value corresponding to the input value. Then, when the corrected color image data is input to the printing apparatus 30, printing with the corrected color is realized.
- the relationship between the input value and the correction value can be obtained with high accuracy.
- the insufficient data can be complemented so as to be connected smoothly by considering the second derivative parameter in the spline function, which is suitable as a correction of color.
- Embodiment 2 will be described.
- the description of the second embodiment mainly addresses differences from the first embodiment. Therefore, the contents that are not particularly described are the same as in the first embodiment.
- the second embodiment differs from the first embodiment mainly in S230 and S250. Then, it starts from explanation of S230 (input value acquisition procedure).
- FIG. 9 is a graph showing the relationship between the output value and the device dependent value.
- FIG. 9 corresponds to FIG. 5 in the description of the first embodiment.
- device dependent values are illustrated as two dimensions.
- the illustrated device dependent values are the K value and the b value obtained by linearizing CMY.
- the relationship T1 defined in the A2B table 25 appears as a curved surface.
- the hatching shown in FIG. 9 indicates the back of the curved surface.
- the relationship T1 can be schematically represented as a curved surface because the CMYK space is four-dimensional while the Lab space is three-dimensional. That is, since the dimension of the output value is small with respect to the device dependent value, a plurality of combinations of device dependent values that realize a certain output value exist in principle. This is also the same in the first embodiment, but in the first embodiment, for simplification of the explanation, the output value and the device-dependent value are also one-dimensional, and the relationship T1 is schematically illustrated as a curve. It is illustrated that a device dependent value that realizes an output value is uniquely determined.
- the output value Lab i is obtained for the device dependent value (b i , K i ) in S220.
- an input value is obtained from the output value Lab i and the relationship T1.
- a method of specifying CMY after specifying the K value and then specifying CMY from the color value space limited by the specified K value is general. Therefore, in the present embodiment, the K value in FIG. It is adopted as an axis.
- the device dependent value closest to the correction value is adopted as the input value.
- the distance between the correction value (b i , K i ) and the device dependent value (b ′ a , K ′ a ) is the distance r a shown in FIG. 9
- the correction value (b i , K i ) is device dependent
- the distance to the values (b ′ b , K ′ b ) is the distance r b shown in FIG.
- J b and J b ′ are expressed by equations (10) and (11).
- J b [c b m b y b k b ] T (10)
- J b ' [c b ' m b 'y b ' k b '] T (11)
- c b is a cyan value constituting the correction value b
- m magenta value
- y yellow value
- k black value
- J b corresponds to the correction value (b i , K i ) in FIG.
- E 2 may be calculated for all K values for which the desired output value falls within the reproduction range, and the minimum value thereof may be searched, or E 2 while slightly updating J b ′.
- the slope of becomes zero it may be determined that E 2 has become minimum.
- the relationship T 1 must be constrained to satisfy Lab i .
- S240 correction value acquisition procedure
- S250 complementary procedure
- FIG. 11 is a graph for explaining the complementing procedure.
- the X axis indicates the K value
- the Y axis indicates the b value
- the Z axis indicates the input value (b ' b , K' b ).
- the number of lattice points is set to 25 for simplification.
- a plurality of spline functions can be defined.
- Each of the plurality of spline functions is defined as either the constant K value (that is, the direction of the b value) or the constant b value (that is, the direction of the K value).
- the spline functions SK1 to SK5 (first spline function) shown in FIG. 11 have a constant K value.
- the spline functions S b1 to S b5 (second spline functions) shown in FIG. 11 have a constant b value.
- each spline function is determined to satisfy the following two conditions.
- the first condition is to go through the points already determined.
- the first condition requires that two spline functions orthogonal in a certain correction value (b b , K b ) have the same value at their grid points.
- the second condition is that the second derivative parameter y "is as close as possible to the spline functions adjacent to each other in the direction orthogonal to the definition direction.
- the spline functions SK3 and SK4 as an example, "and, second derivative parameter y spline function S K4 at the grid points Q34" second derivative parameter y spline function S K3 at the lattice point Q33 will be that as closely as possible the value of the.
- setting the second derivative parameter y ′ ′ at the end point to zero is a general supplementary condition.
- the objective function for the direction 1 in the second embodiment is obtained by squaring the equation (15) as in the equation (8) (Eq. (16)), and is defined in the same manner as the objective function for the direction 1
- the entire objective function of Embodiment 2 can be obtained by adding an objective function in the second direction.
- An objective function can be defined for the missing data complement procedure in the second embodiment.
- the missing data can be obtained by obtaining the unknown element y u (insufficient input value) so that the objective function defined in this way is minimized.
- the color correction table 22 is created so that the input value and the output value are as close as possible, so that the change in the device dependent value accompanying the correction can be reduced. Also, as described in conjunction with FIG. 11, the effect of substantially matching the curved surface formation in the adjacent direction is obtained, which is preferable.
- the third embodiment will be described. According to the third embodiment, different colorimetry is performed in view of the case where the A2B table is created by a colorimetry device (hereinafter referred to as a reference colorimetry device) different from the colorimetry device 35 mounted on the printing device 30. An error caused by using the device can be secured.
- a colorimetry device hereinafter referred to as a reference colorimetry device
- FIG. 12 is a flowchart showing color image data correction processing in the third embodiment.
- colorimetry device correction processing is executed (S100) (colorimetry device correction procedure).
- FIG. 13 is a flowchart showing the colorimetric device correction process.
- a device dependent value is input to the reference printing apparatus (S110).
- the device dependent value input in S110 is the same as the value input in S210.
- the reference printing apparatus prints a patch in accordance with the input value.
- the patch printed in S110 (hereinafter referred to as a reference patch) is subjected to color measurement by the color measurement device 35 of the printing device 30 (S120). That is, the user carries the reference patch from the reference printing device to the printing device 30, and activates the color measurement device 35 of the printing device 30 to perform color measurement.
- the input value is acquired (S130).
- S130 is performed like S230.
- the input value obtained here corresponds to the device dependent value input to the reference colorimetric device.
- the correction value in S140 corresponds to the device dependent value input to the color measurement device 35. Further, S140 executes the same processing as S240 in the first embodiment.
- S150 is performed similarly to S250 described in the first embodiment.
- Colorimetry device correction is performed using the color correction table created up to this point (S160).
- the colorimetric device correction generates the A2B table as a colorimetric device correction A2B table using the correspondence relationship created in S150 and the conversion shown in FIG.
- the colorimetric device correction A2B table includes the correction value (device dependent value corresponding to the colorimetric device 35) and the input value (device dependent value corresponding to the reference colorimetric device) obtained in S150. And the correspondence between the correction value (device dependent value corresponding to the color measuring device 35) and the color value by the A2B table.
- the colorimetric device correction A2B table created in this manner is used in the color correction table creation process (S200).
- the color correction table creation process of the third embodiment is different from that of the first embodiment in S230. This point will be described with reference to FIG.
- FIG. 15 is a graph showing the relationship between the output value and the device dependent value.
- the device dependent values b 'rather than i obtains "the i input value b" device dependent value b as i (S230).
- the input value b ′ ′ i is a value on the horizontal axis at the intersection of the relationship T1 ′ and the output value Lab i .
- the relationship T1 ′ is a colorimetric device correction A2B table obtained by S100.
- the shift between the relationship T1 ′ and the relationship T1 is a shift caused by the reference colorimetry device and the colorimetry device 35. Because the reference patch is printed by the reference printing apparatus, there is no deviation of the output value. Therefore, if there is a deviation between the relation T1 ′ and the relation T1, the deviation is caused by a measurement error of the color measurement device 35 of the printing apparatus 30.
- the color values acquired in S220 are measured using the color measurement device 35 instead of the reference color measurement device, in S230, measurement is performed instead of the relationship T1.
- the input value is acquired using the relationship T1 ′ (colorimetry device correction A2B table) corrected on the assumption that the color device 35 is acquired.
- the present invention is not limited to the embodiments, examples, and modifications of the present specification, and can be realized in various configurations without departing from the scope of the present invention.
- the technical features in the embodiments, examples, and modifications corresponding to the technical features in the respective forms described in the section of the summary of the invention are for solving some or all of the problems described above, or As needed, in order to achieve part or all of the aforementioned effects, replacements and combinations can be made.
- the technical feature is not described as essential in the present specification, it can be deleted as appropriate. For example, the following are exemplified.
- parameters other than the second derivative parameters may be considered. For example, it may be determined to minimize the sum of squares of first derivative parameters.
- the colors that make up the device dependent value may be changed.
- device dependent values may be configured by adding special colors such as red and green to CMY (or RGB) or CMYK.
- some or all of the functions and processes implemented by software may be implemented by hardware. Also, some or all of the functions and processes implemented by hardware may be implemented by software. As hardware, for example, various circuits such as integrated circuits, discrete circuits, or circuit modules combining those circuits may be used.
- color image data correction device 22 color correction table 25 A2B table 30 printing device 35 color measuring device 50 printing system.
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Abstract
Description
Ay"=By・・・(1)
従って、2次微分パラメーターy"は、下記の式で求めることができる。
y"=A-1By・・・(2)
y=[y0 … yi … yn-1]T・・・(3)
y"=[y"1 … y"i … y"n-2]T・・・(4)
y"=A-1Buyu+A-1Bkyk・・・(7)
E=y"Ty"・・・(8)
E2=|Jb'-Jb|2・・・(9)
Jb=[cb mb yb kb]T・・・(10)
Jb'=[cb' mb' yb' kb']T・・・(11)
cbは補正値bを構成するシアン値であり、cb'は入力値b'を構成するシアン値である。m(マゼンタ値)、y(イエロー値)、k(ブラック値)についても同様である。また、Jbは、図9における補正値(bi,Ki)に該当する。
y"j (1)-y"j+1 (1)=A(1)-1B(1)(yj (1)-yj+1 (1))・・・(12)
ここで、方向1についてスプライン関数を定義していることを上付きの(1)として表しており、また、行列A並びに行列Bは、式(5)並びに式(6)と同様に定義できる。
Claims (9)
- 印刷装置に入力される印刷データとしてのデバイス依存値を補正する色補正テーブルを作成する色補正テーブル作成方法であって、
所定のデバイス依存値を前記印刷装置に入力することによって作成された印刷物の測色結果を、出力値として取得する出力値取得手順と、
前記取得された出力値が基準印刷装置によって作成された印刷物によって実現されるためのデバイス依存値を、前記色補正における入力値として取得する入力値取得手順と、
前記所定のデバイス依存値を、前記入力値に対応する補正値として取得する補正値取得手順と、
前記入力値と前記補正値との関係を利用して前記色補正テーブルを作成する作成手順と、
を含む色補正テーブル作成方法。 - 前記入力値と前記補正値との関係を補完する補完手順を更に含み、
前記作成手順では、前記色補正テーブルの格納対象となる前記入力値の少なくとも一部に対し、前記補完した結果を利用して前記補正値を決定する
請求項1に記載の色補正テーブル作成方法。 - 前記補完手順では、スプライン関数を用いる
請求項2に記載の色補正テーブル作成方法。 - 前記補完手順において用いる、3次スプライン関数の各格子点における2次微分パラメーターの2乗和が最小になるように、前記入力値を決定する
請求項3に記載の色補正テーブル作成方法。 - 前記補完手順において用いる3次スプライン関数には、それぞれ直交する第1~第nの方向によって定義された第1~第n(nは2以上の整数)のスプライン関数が含まれ、
第m(mは1~nのうちの任意の整数)の方向のスプライン関数の或る格子点における2次微分パラメーターと、前記第mの方向と直交する方向において前記或る格子点と隣接する格子点を通る、他の第mの方向のスプライン関数の前記隣接する格子点における2次微分パラメーターとの差の2乗を、前記第1~第nの方向での組み合わせおよび全格子点を対象に算出して合計した値が最小になるように、前記入力値を決定する
請求項3に記載の色補正テーブル作成方法。 - 前記印刷データとしてのデバイス依存値は、n(nは2以上の整数)次元で定義され、
前記入力値取得手順において、前記入力値の候補の中から、前記n次元の空間における前記所定のデバイス依存値との距離が最短となる値を前記入力値として取得する
請求項1から請求項5までの何れか一項に記載の色補正テーブル作成方法。 - 前記入力値取得手順において前記印刷物の測色に用いる測色装置の特性と、基準測色装置の特性とのずれを補正する測色装置補正手順を更に含み、
前記入力値取得手順では、前記測色装置補正手順において取得されたデバイス依存値と出力値との対応関係を用いて、前記入力値を取得する
請求項1から請求項6までの何れか一項に記載の色補正テーブル作成方法。 - 印刷装置に入力される印刷データとしてのデバイス依存値を補正する色補正テーブルを作成する色補正テーブル作成装置であって、
所定のデバイス依存値を前記印刷装置に入力することによって作成された印刷物の測色結果を、出力値として取得する出力値取得手順と、
前記取得された出力値が基準印刷装置によって作成された印刷物によって実現されるためのデバイス依存値を、前記色補正における入力値として取得する入力値取得手順と、
前記所定のデバイス依存値を、前記入力値に対応する補正値として取得する補正値取得手順と、
前記入力値と前記補正値との関係を利用して前記色補正テーブルを作成する作成手順と、
を実行する色補正テーブル作成装置。 - 印刷装置に入力される印刷データとしてのデバイス依存値を補正する色補正テーブルを作成するためのプログラムであって、
所定のデバイス依存値を前記印刷装置に入力することによって作成された印刷物の測色結果を、出力値として取得する出力値取得手順と、
前記取得された出力値が基準印刷装置によって作成された印刷物によって実現されるためのデバイス依存値を、前記色補正における入力値として取得する入力値取得手順と、
前記所定のデバイス依存値を、前記入力値に対応する補正値として取得する補正値取得手順と、
前記入力値と前記補正値との関係を利用して前記色補正テーブルを作成する作成手順と、
をコンピューターに実行させるためのプログラム。
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