JP6234117B2 - Printing apparatus, control method thereof, and control program - Google Patents

Description

  The present invention relates to a printing apparatus, a control method therefor, and a control program, and more particularly, to printing control in a so-called sublimation printer using a thermal head which is one of printing apparatuses.

  In general, a so-called sublimation type printer using a thermal head is known as one of printing apparatuses. In a conventional sublimation type printer, printing is performed by a method of one-time printing that uses a thermal head to thermally transfer onto a print medium using ink sheets of yellow (Y), magenta (M), and cyan (C). Yes.

  Further, unlike the above-described printing method, there is a so-called double-stroke method in which printing is performed by sublimating yellow (Y), magenta (M), and cyan (C) inks onto a printing medium twice. With this method, it is possible to obtain a printing result having a higher density than the one-time printing method.

  For example, after printing with a yellow (Y), magenta (M), and cyan (C) ink on an ink ribbon on a printing medium (also referred to as a transfer paper), the next yellow, magenta, and cyan inks are printed. In some cases, printing by printing is performed so as to be superimposed on a portion of the transfer paper that has been printed with three colors (see Patent Document 1).

JP 2007-276259 A

  By the way, in recent years, in a sublimation type printer, a user's preferred printing method is selected by a user selecting either an ink cartridge for single strike printing or an ink cartridge for double strike printing. There is.

  Since the ink cartridge for double-printing printing consumes twice as much ink as the ink cartridge for single-printing printing, the printing cost inevitably doubles. Therefore, a user who performs two-time printing generally expects a clear difference in printing compared to one-time printing.

  However, the double strike printing described in Patent Document 1 mainly improves only the density and saturation of dark areas. For this reason, when there is not much dark part in the image data, there is no clear difference in printing between the one-time printing and the two-time printing, and the user's expectation can be answered considering the printing cost. difficult.

  Accordingly, an object of the present invention is to provide a printing apparatus, a control method thereof, and a control program capable of performing clearer printing than double printing in double printing.

  In order to achieve the above object, a printing apparatus according to the present invention is a printing apparatus that performs printing by transferring a plurality of colors of ink to a printing medium according to image data, and prints the print data obtained from the image data. In response, each of the plurality of colors of ink is transferred to the print medium once and printing is performed, and each of the plurality of colors of ink is set at least twice according to the print data. Control means for selectively transferring to the second print mode for printing on the print medium, and printed matter obtained by printing in the first print mode when printing is performed in the second print mode And at least the saturation of the image data so as to be adjusted image data so that there is a difference between the print data obtained by printing in the second print mode and the print data obtained by printing in the second print mode, and the print data according to the adjusted image data. And having a correction means for generating a.

  The control method according to the present invention is a control method of a printing apparatus that performs printing by transferring a plurality of colors of ink to a print medium according to image data, and the plurality of colors according to print data obtained from the image data. A first printing mode in which each color ink is transferred to the printing medium and printing is performed once, and each of the plurality of color inks is transferred to the printing medium at least twice according to the print data. A control step of selectively performing a second print mode for performing printing, and when printing is performed in the second print mode, a printed matter obtained by printing in the first print mode and the second print mode The image data is adjusted to obtain adjusted image data so that there is a difference with the printed matter obtained by printing in the print mode, and the print data is generated according to the adjusted image data. A positive step, characterized by having a.

  A control program according to the present invention is a control program used in a printing apparatus that performs printing by transferring a plurality of colors of ink to a printing medium in accordance with image data, and is obtained from the image data in a computer included in the printing apparatus. Each of the plurality of color inks is transferred to the print medium once in accordance with the print data, and printing is performed, and each of the plurality of color inks is in accordance with the print data. A control step of selectively performing a second printing mode in which printing is performed by transferring to the printing medium at least twice, and when the printing is performed in the second printing mode, the first printing mode Adjusted image data by adjusting at least the saturation in the image data so that there is a difference between the printed material obtained by printing and the printed material obtained by printing in the second printing mode. And, wherein the executing a correction step of generating the print data in accordance with the adjusted image data.

  According to the present invention, when printing is performed by transferring each of a plurality of colors of ink to a printing medium at least twice, a printed matter obtained by printing that transfers each of the plurality of colors of ink to the printing medium once and a plurality of colors of printing are obtained. Adjust at least the saturation in the image data to make the adjusted image data so that there is a difference between the prints obtained by transferring each of the inks to the printing medium at least twice, and print according to the adjusted image data Generate data. As a result, it is possible to always produce a difference in the print result between the single-shot printing and the double-printing printing.

It is a block diagram which shows an example of the printing apparatus by embodiment of this invention. 2 is a flowchart for explaining a printing operation in the printer shown in FIG. It is a figure for demonstrating an example of the print image selected by the user, (a) is a figure which shows the print image selected by the user, (b) is an example of the accumulation histogram of the print image shown to (a). FIG. FIGS. 3A and 3B are diagrams for explaining an example of a double strike printing adjustment determination process shown in FIG. 2. FIG. 3A is a flowchart for explaining a double strike printing adjustment determination process, and FIG. It is a figure which shows an example of the selection table used for selection of a three-dimensional lookup table. FIG. 9 is a diagram for explaining another example of the double strike printing adjustment determination process shown in FIG. 2.

  Hereinafter, a printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram illustrating an example of a printing apparatus according to an embodiment of the present invention.

  The illustrated printing apparatus is a so-called sublimation printer, and has a card reader 101. Various memory cards are set in the card reader 101. When a memory card is set in the card reader 101, for example, JPEG image data recorded in the memory card is read under the control of the system control unit 103.

  The ROM 102 stores a program for controlling the printer and the like, and stores a three-dimensional look-up table for double printing adjustment described later. Further, the ROM 102 stores a color conversion three-dimensional lookup table for one-time printing and two-time printing.

  A system control unit 103 controls the entire printer. The system control unit 103 executes a program stored in the ROM 102 to control the entire printer. For example, JPEG image data read by the card reader 101 is held in the RAM 104.

  For example, the image processing unit 105 decompresses Jpeg image data read by the card reader 101. Here, the image processing unit 105 performs extension processing to convert Jpeg image data into image data in the YCbCr format.

  Note that the image processing unit 105 performs various types of image processing, which will be described later, and effect determination for double printing adjustment.

  The print image generation unit 106 receives YCbCr format image data from the image processing unit 105 and converts it into YMC format print data. In other words, the print image generation unit 106 performs color conversion processing on YCbCr format image data in accordance with a color space corresponding to a plurality of inks, and generates YMC format print data. Since the sublimation printer performs printing by a sublimation thermal transfer recording method, an ink cartridge in which an ink sheet and paper are integrated is used.

  At the time of printing (that is, at the time of printing), the ink sheet covers the printing area of the printing medium (also referred to as paper). The ink sheet has a size substantially equal to the size of the print area, and each of the yellow (Y), magenta (M), and cyan (C) ink layers (that is, a plurality of color inks) and an overcoat (OC) layer are provided. It is provided side by side. Then, thermal transfer is performed for each layer, the paper (printing medium) is returned to the recording start position, and the ink is sequentially transferred onto the paper. Thereby, a printed matter is generated.

  Note that, here, unlike the ink cartridge used for the two-time printing described later and the ink cartridge used for the one-time printing, the two-time printing (that is, the second printing mode) and the one-time printing (that is, the first printing) (1 print mode) is distinguished by an identification terminal physically provided on the ink cartridge.

  As a result, the system control unit 103 identifies the first print mode or the second print mode by the identification terminal, and selectively performs the first print mode and the second print mode. become.

  The print processing unit 107 receives YMC format print data from the print image generation unit 106 and transfers the print data from a thermal head controller (not shown) to a thermal head (not shown). Accordingly, the print processing unit 107 sequentially performs thermal transfer on the paper according to the print data.

  At this time, as described above, the print processing unit 107 performs thermal transfer for one layer, then returns the sheet to the recording start position, performs thermal transfer for another layer, and performs thermal transfer for all colors, that is, printing. Do.

  When the ink cartridge mounted on the print processing unit 107 is an ink cartridge for two-time printing, the print processing unit 107 has yellow (Y), magenta (M), cyan (C), yellow (Y ), Magenta (M), cyan (C), and OC in total in the order of seven thermal transfers. That is, in the second printing mode, each of the plurality of colors of ink is thermally transferred to the paper at least twice.

  The image display unit 108 displays an image corresponding to a plurality of JPEG image data recorded on the memory card under the control of the system control unit 103, and the user should print from the image displayed on the image display unit 108. An image can be selected as a print image.

  A user interface (UI) operation unit 109 is used when a user gives various instructions to the system control unit 103. The UI operation unit 109 is provided with up / down / left / right buttons and a print button for operating a menu screen displayed on the image display unit 113.

  FIG. 2 is a flowchart for explaining a printing operation in the printer shown in FIG. 2 is performed under the control of the system control unit 103.

  Now, when the user inserts a memory card storing image data (Jpeg) into the card reader 101, the system control unit 103 controls the card reader 101 to read a plurality of image data recorded on the memory card. The system control unit 103 displays an image corresponding to the image data on the image display unit 108.

  The user selects a desired image as a print image (also referred to as a print image) from the images displayed on the image display unit 108 using the UI operation unit 109 (step S201).

  FIG. 3 is a diagram for explaining an example of a print image selected by the user. FIG. 3A is a diagram illustrating a print image selected by the user, and FIG. 3B is a diagram illustrating an example of a cumulative histogram of the print image illustrated in FIG.

  Here, it is assumed that the user selects the image shown in FIG. 3A as a print image using the UI operation unit 109. Note that the print image shown in FIG. 3A is an image taken at a ski resort.

  Subsequently, the system control unit 103 determines whether a print button (also referred to as a print setting button) provided in the UI operation unit 109 has been pressed (step S202). If the print setting button is not pressed even after the predetermined time has elapsed (NO in step S202), the system control unit 103 returns to the process of step S201 and waits for the user to select image data.

  On the other hand, when the print setting button is pressed (YES in step S202), the system control unit 103 reads image data corresponding to the selected image from the memory card by the card reader 101 (step S203). Then, under the control of the system control unit 103, the image processing unit 105 performs image data decompression processing, and stores the decompressed image data in the RAM 104.

  Here, as described above, it is assumed that the image data read from the memory card is Jpeg image data, and the decompressed image data is 8-bit YCbCr format image data.

  Next, the system control unit 103 reads the decompressed image data (YCbCr1) from the RAM 104. Under the control of the system control unit 103, the image processing unit 105 corrects the decompressed image data, and stores the corrected image data (YCbCr2) in the RAM 104 (step S204).

  Here, in the correction processing performed in the image processing unit 105, for example, correction processing such as image brightness, contrast, and color balance is performed using an image analysis method such as face detection and contrast.

  At this time, the image processing unit 105 obtains correction processing information (including face detection information) indicating brightness, contrast, color balance, and the like corrected by the correction processing.

  Furthermore, the image processing unit 105 also performs effect processing (filter processing, for example, black and white processing and sepia processing) for applying various filter effects set in advance by the user in the correction processing.

  At this time, the image processing unit 105 obtains effect processing information indicating the effect imparted by the effect processing (including at least black and white processing information indicating whether or not black and white processing has been performed).

  The image processing unit 105 stores the correction processing information and effect processing information in the RAM 104 as correction processing information. This correction processing information is used in the double printing adjustment determination processing described later.

  Subsequently, the system control unit 103 determines whether or not an ink cartridge for double printing is attached to the print processing unit 107 (step S205). If the ink cartridge for double printing is not attached to the print processing unit 107 (NO in step S205), the system control unit 103 controls the print image generation unit 107 to correct the corrected image data (YCbCr2). Is subjected to color conversion processing to generate image data after color conversion (YMC1) (step S206). The system control unit 103 stores the color-converted image data (YMC1) in the RAM 104.

  In the color conversion process, under the control of the system control unit 103, the print image generation unit 106 performs the color conversion process using the one-time three-dimensional lookup table stored in the ROM 102, and uses the YCbCr format. Image data in C, M, Y (cyan, magenta, yellow) format is generated.

  Next, the system control unit 103 transfers the color-converted image data (YMC1) from the RAM 104 to the print processing unit 107. Here, since the ink cartridge for one-time printing is attached to the print processing unit 107, the print processing unit 107 performs yellow (Y), magenta (M), cyan (C), and OC once, A total of four thermal transfer processes are performed to execute the printing process (step S207). When the print processing by the print processing unit 107 ends, the system control unit 103 ends printing.

  If the ink cartridge for double-printing printing is mounted on the print processing unit 107 (YES in step S205), the system control unit 103 transfers the corrected image data (YCbCr2) from the RAM 104 to the image processing unit 105. . Then, the system control unit 103 performs a double strike printing adjustment determination process (step S208).

  In this double strike printing adjustment determination process, when printing is performed using an ink cartridge for double strike printing, it is quantitatively determined how much optical difference occurs in the print result compared to the single strike printing. Is determined. That is, when printing is performed in the second print mode, the system control unit 103 calculates the difference between the light amount in the printed matter obtained by printing in the first print mode and the light amount in the printed matter obtained by printing in the second print mode. Predicting and quantitatively determining whether an optical difference occurs.

  Then, the system control unit 103 selects one as a selected three-dimensional lookup table from among a plurality of two-dimensional printing adjustment three-dimensional lookup tables stored in advance in the ROM 102 according to the determination result.

  Subsequently, the system control unit 103 converts the corrected image data (YCbCr2) into image data (YCbCr3) after the double strike printing adjustment according to the selected three-dimensional lookup table by the image processing unit 105 (step S209). Then, under the control of the system control unit 103, the image processing unit 105 stores the image data after the double strike printing adjustment (simply referred to as “adjusted image data: YCbCr3”) in the RAM 104. Store.

  Next, the system control unit 103 transfers the image data (YCbCr3) after the double strike printing adjustment from the RAM 104 to the print image generation unit 107. Under the control of the system control unit 103, the print image generation unit 107 performs a color conversion process on the image data (YCbCr3) after the double strike printing adjustment, and generates image data (YMC1) after the color conversion (step). S210). Then, the system control unit 103 stores the color-converted image data (YMC2) in the RAM 104.

  In this color conversion process, under the control of the system control unit 103, the print image generation unit 106 performs color conversion processing using a two-dimensional 3D lookup table stored in the ROM 102, and performs YCbCr Image data in C, M, Y (cyan, magenta, yellow) format is generated from the format image data.

  After the process of step S210, the system control unit 103 proceeds to the process of step S207 and executes the printing process. Here, the system control unit 103 transfers the image data (YMC2) after color conversion from the RAM 104 to the print processing unit 107.

  Since the ink cartridge for double strike printing is mounted on the print processing unit 107, the print processing unit 107 includes yellow (Y), magenta (M), cyan (C), yellow (Y), magenta (M), A total of seven thermal transfer processes are performed in the order of cyan (C) and OC to execute the printing process.

  FIG. 4 is a diagram for explaining an example of the double strike printing adjustment determination process shown in FIG. FIG. 4A is a flowchart for explaining the double strike printing adjustment determination process, and FIG. 4B is an example of a selection table used for selecting the three-dimensional lookup table for double strike printing adjustment. FIG.

  In the twice-printed print adjustment determination process, the degree to which a clear difference is generated in the print result by double-printed printing is quantitatively determined according to the cumulative histogram normalized with the number of pixels of the corrected image data (YCbCr2). Predict. When the degree is small, the saturation is increased so that a difference is produced in the print result between the one-time printing and the two-time printing.

  When the double printing adjustment determination process is started, the system control unit 103 transfers the corrected image data (YCbCr2) stored in the RAM 104 to the image processing unit 105. Then, under the control of the system control unit 103, the image processing unit 105 acquires a cumulative histogram distribution related to yellow (Y) for the corrected image data (YCbCr2) (step S401).

  Assume that this cumulative histogram distribution is, for example, the cumulative histogram distribution shown in FIG. In the example shown in FIG. 3B, the horizontal axis indicates the gradation, and the vertical axis indicates the cumulative histogram. As shown in FIG. 3B, since the selected image data is image data taken at a ski resort, there are few dark areas.

  Since the cumulative histogram is normalized by the number of pixels of the image data, the cumulative histogram becomes 1 at the gradation number 255.

  Subsequently, the system control unit 103 obtains a cumulative histogram value Hist [128] of the 128 th gradation according to the cumulative histogram distribution (step S402). In the example shown in FIG. 3B, Hist [128] = 0.25.

  A selection table shown in FIG. 4B is stored in the ROM 102 in advance. Based on Hist [128] (here, 0.25), the system control unit 103 uses the selection table to select a two-time printing adjustment three-dimensional lookup table (3DLUT) (step S403).

  As shown in FIG. 4B, the three-dimensional look-up table for double printing adjustment stored in the ROM 102 is 3DLUT0 and 3DLUT1, where 0.5 ≦ Hist [128] <1.00. Then, the system control unit 103 does not select any two-time printing adjustment three-dimensional lookup table. That is, in this case, the two-time printing adjustment three-dimensional lookup table process is not performed.

  When 0.25 ≦ Hist [128] <0.5, the system control unit 103 selects 3DLUT1 as the selected three-dimensional lookup table. If 0 ≦ Hist [128] <0.25, the system control unit 103 selects 3DLUT0 as the selected three-dimensional lookup table. That is, the system control unit 103 obtains a cumulative histogram for each gradation of image data, and determines whether to generate adjusted image data according to the histogram.

  Here, each of 3DLUT0 and 3DLUT1 is a three-dimensional lookup table for enhancing saturation, and the amount of enhancement is larger in 3DLUT0 than in 3DLUT1.

  In the illustrated example, since Hist [128] = 0.25, in step S403, the system control unit 103 selects 3DLUT1 as the selected three-dimensional lookup table. Then, the system control unit 103 ends the double strike printing adjustment determination process.

  In this way, as the cumulative histogram normalized by 128 gradations is lower, the saturation enhancement amount is increased, and as a result, the difference between the double strike print result and the single strike print result can be clarified.

  In the above example, the saturation is enhanced according to the cumulative histogram. However, not only the saturation but also contrast and the like may be enhanced.

  FIG. 5 is a diagram for explaining another example of the double strike printing adjustment determination process shown in FIG. In the determination process shown in FIG. 5, the two-time printing adjustment three-dimensional lookup table (3DLUT) is selected using the above-described correction processing information.

  In the example illustrated in FIG. 5, the ROM 102 stores a saturation enhancement 3DLUT for persons, a saturation enhancement 3DLUT, and a contrast enhancement 3DLUT in advance as a two-time printing adjustment three-dimensional lookup table. Shall.

  The person-intensity saturation enhancement 3DLUT is a table for performing saturation enhancement only on the other color gamut without saturation enhancement on the skin color area of the person. The saturation enhancement 3DLUT is a table for enhancing the saturation for all color regions of the image. The contrast enhancement 3DLUT is a table for enhancing the contrast of monochrome data (monochrome area).

  When the double printing adjustment determination process is started, the system control unit 103 acquires the correction process information stored in the RAM 104 in step 204 described above (step S404). As described above, the correction processing information includes correction processing information and effect processing information. The correction processing information includes face detection information, and the effect processing information includes at least black and white processing information.

  Subsequently, the system control unit 103 determines whether or not a face region (also simply referred to as a face) is detected in the corrected image data (YCbCr2) based on the correction processing information (that is, face detection information here) ( Step S405). If no face area is detected in the corrected image data (YCbCr2) (NO in step S405), the system control unit 103 corrects the image data after correction based on the effect processing information (that is, the black and white processing information here) ( It is determined whether or not monochrome processing has been performed in YCbCr2) (step S406).

  If the black and white processing is not performed on the corrected image data (YCbCr2) (NO in step S406), the system control unit 103 selects a saturation enhancement 3DLUT from the ROM 102 as a selected three-dimensional lookup table (step S406). S407). In other words, the corrected image data (YCbCr2) has no face area (that is, a person) and no black and white data, so the system control unit 103 selects the saturation enhancement 3DLUT. As a result, saturation enhancement is performed for the entire color gamut.

  On the other hand, if black and white processing is performed on the corrected image data (YCbCr2) (YES in step S406), the system control unit 103 selects a contrast enhancement 3DLUT from the ROM 102 as a selected three-dimensional lookup table (step S406). S408). In other words, since the corrected image data (YCbCr2) has no face area but is subjected to black and white processing, the system control unit 103 selects the contrast enhancement 3DLUT.

  As a result, the contrast is enhanced for monochrome data having no saturation (that is, a monochrome area), and a difference between the print result in the double strike printing and the print result in the single strike printing can be generated.

  When a face area is detected in the corrected image data (YCbCr2) (YES in step S405), the system control unit 103 selects the saturation enhancement 3DLUT for persons from the ROM 102 as a selected three-dimensional lookup table. (Step S409). That is, since there is a face area for the corrected image data (YCbCr2), the system control unit 103 selects the saturation enhancement 3DLUT for person.

  As a result, in the corrected image data (YCbCr2), the color enhancement of only the other color gamut is performed without emphasizing the human skin color area. As a result, when there is a person, skin color enhancement and natural color conversion in the skin color region are possible.

  As described above, in the double strike printing adjustment determination process shown in FIG. 5, one is selected from a plurality of double strike printing adjustment three-dimensional lookup tables according to the correction processing information. Appropriate adjustment processing can be performed in accordance with the correction of the image data, so that the difference between the print results can be always clarified between the one-time printing and the two-time printing.

  As is clear from the above description, in the example shown in FIG. 1, the system control unit 103 and the print processing unit 107 function as control means. Further, the system control unit 103, the image processing unit 105, and the print image generation unit 106 function as a correction unit. The system control unit 103 and the image processing unit 105 function as a first determination unit and a second determination unit.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to these embodiment, Various forms of the range which does not deviate from the summary of this invention are also contained in this invention. .

  For example, the function of the above embodiment may be used as a control method, and this control method may be executed by the printing apparatus. Further, a program having the functions of the above-described embodiments may be used as a control program, and the computer provided in the printing apparatus may be caused to execute the control program. The control program is recorded on a computer-readable recording medium, for example.

  Each of the above control method and control program has at least a control step and a correction step.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various recording media, and the computer (or CPU, MPU, etc.) of the system or apparatus reads the program. To be executed.

101 Card reader 102 ROM
103 System control unit 104 RAM
DESCRIPTION OF SYMBOLS 105 Image processing part 106 Print image generation part 107 Print processing part 108 Image display part 109 UI operation part

Claims (13)

A printing apparatus that performs printing by transferring a plurality of colors of ink to a printing medium according to image data,
In accordance with print data obtained from the image data, a first print mode in which each of the plurality of colors of ink is transferred to the print medium once for printing, and the plurality of colors in accordance with the print data. Control means for selectively performing a second print mode in which each of the color inks is transferred to the print medium at least twice to perform printing;
In the image data, when printing is performed in the second print mode, there is a difference between a printed material obtained by printing in the first printing mode and a printed material obtained by printing in the second printing mode. Correction means for adjusting at least the saturation to obtain adjusted image data, and generating the print data according to the adjusted image data;
A printing apparatus comprising:   The printing apparatus according to claim 1, wherein the correction unit performs color conversion processing on the adjusted image data in a color space corresponding to the plurality of inks to generate the print data.   When printing is performed in the first print mode, the correction unit performs color conversion processing on the image data according to a color space corresponding to the plurality of inks to generate the print data. The printing apparatus according to claim 1 or 2.   The correction means obtains a cumulative histogram for each gradation of the image data, and generates the adjusted image data so that a difference is produced according to the histogram. The printing apparatus according to claim 1.   The correction means obtains a cumulative histogram for each gradation of the image data, and determines whether or not to generate the adjusted image data according to the histogram. The printing apparatus according to any one of the above.   The printing apparatus according to claim 5, wherein the correction unit adjusts the saturation according to a cumulative histogram corresponding to a preset gradation to obtain the adjusted image data.   The printing apparatus according to claim 6, wherein the correction unit emphasizes the saturation as a cumulative histogram corresponding to the preset gradation becomes smaller. First determination means for determining whether a person exists in the image data;
Second determining means for determining whether or not a filtering process for reducing saturation is performed on the image data;
When the first determination unit determines that a person exists in the image data, the correction unit emphasizes the saturation of only the other color gamut without enhancing the saturation of the person's skin color region. The printing apparatus according to claim 1, wherein adjusted image data is obtained.   When the first determination unit determines that there is no person in the image data and the second determination unit determines that the filtering process is not performed, the correction unit The printing apparatus according to claim 8, wherein the post-adjustment image data is obtained by emphasizing saturation for all color regions.   When the first determining unit determines that no person is present in the image data and the second determining unit determines that the filtering process is being performed, the correcting unit performs the filtering process. 10. The printing apparatus according to claim 8, wherein the adjusted image data is obtained by emphasizing a contrast of the performed region.   The printing apparatus according to claim 1, wherein printing is performed by thermal transfer using a thermal head in each of the first printing mode and the second printing mode. A method for controlling a printing apparatus that performs printing by transferring a plurality of colors of ink to a printing medium according to image data,
In accordance with print data obtained from the image data, a first print mode in which each of the plurality of colors of ink is transferred to the print medium once for printing, and the plurality of colors in accordance with the print data. A control step of selectively performing a second printing mode in which each of the color inks is transferred to the printing medium at least twice and printed.
In the image data, when printing is performed in the second print mode, there is a difference between a printed material obtained by printing in the first printing mode and a printed material obtained by printing in the second printing mode. A correction step of adjusting at least the saturation to obtain adjusted image data, and generating the print data according to the adjusted image data;
A control method characterized by comprising: A control program used in a printing apparatus that performs printing by transferring a plurality of colors of ink to a printing medium according to image data,
A computer provided in the printing apparatus;
In accordance with print data obtained from the image data, a first print mode in which each of the plurality of colors of ink is transferred to the print medium once for printing, and the plurality of colors in accordance with the print data. A control step of selectively performing a second printing mode in which each of the color inks is transferred to the printing medium at least twice and printed.
In the image data, when printing is performed in the second print mode, there is a difference between a printed material obtained by printing in the first printing mode and a printed material obtained by printing in the second printing mode. A correction step of adjusting at least the saturation to obtain adjusted image data, and generating the print data according to the adjusted image data;
A control program characterized by causing

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