Printing apparatus, method for controlling printing apparatus, and computer-readable storage medium

1. A printing apparatus, comprising:

a head having first nozzles for printing an image based on image data in inks in basic colors on a printing medium and second nozzles for printing an image based on the image data in an ink in a custom color different from the basic colors on the printing medium;

first flow paths for supplying the inks in the basic colors to the first nozzles;

at least one second flow path for supplying the ink in the custom color to the second nozzles;

a display; and

a controller configured to:

acquire an imaging color gamut, the imaging color gamut being a gamut in a predetermined color space including color values included in the image data;

for each of a plurality of option colors, acquire a printing color gamut in the predetermined color space, the printing color gamut including color values of colors printable with the first nozzles and the second nozzles in the inks in the basic colors and the option color, one of the plurality of option colors being selectable as the custom color;

acquire an evaluation value for each of the plurality of option colors based on a comparison between the printing color gamut and the imaging color gamut; and

before loading the at least one second flow path with the ink in the custom color, display a ranked order of the plurality of option colors based on the evaluation values in the display.

2. The printing apparatus according to claim 1 , wherein the imaging color gamut includes color values included in image data of a plurality of images.

3. The printing apparatus according to claim 1 , wherein the evaluation value acquired for each of the plurality of option colors includes a ratio of an area of a part of the image corresponding to the imaging color gamut falling within the printing color gamut for the option color to a total area of the image.

4. The printing apparatus according to claim 1 , wherein the evaluation value acquired for each of the plurality of option colors includes a ratio of a volume of the imaging color gamut falling within the printing color gamut for the option color to a volume of the imaging color gamut in the predetermined color space.

5. The printing apparatus according to claim 1 , wherein

the imaging color gamut includes a first color gamut, the first color gamut being a gamut in the predetermined color space including color values included in a first part of the image, the first part having a size equal to or greater than a predetermined size, a color difference between the color values in the first part and color values in a periphery of the first part being equal to or greater than a predetermined color difference,

the controller is configured to:

determine whether the first color gamut falls within the printing color gamut for each of the plurality of option colors, and

display a result of the determination along with the ranked order of the plurality of option colors in the display.

6. The printing apparatus according to claim 1 , wherein the controller is configured to display the image in the display in an appearance such that a part of the image having color values falling within the imaging color gamut but not falling within the printing color gamut for the option color and another part of the image having color values falling within the imaging color gamut and within the printing color gamut for the option color are distinguished.

7. The printing apparatus according to claim 6 , wherein the controller is configured to:

convert the color values falling within the imaging color gamut but not falling within the printing color gamut for the option color into another color value,

display the part of the image corresponding to the color values falling within the imaging color gamut but not falling within the printing color gamut for the option color based on the another color value in the display, and

display the another part of the image corresponding to the color values falling within the imaging color gamut and within the printing color gamut for the option color based on the color value without converting in the display.

8. The printing apparatus according to claim 1 , further comprising an input device configured to designate a position in the display,

wherein the controller is configured to:

display the predetermined color space expressing the imaging color gamut in the display, and

display a color difference between a color value at a position in the predetermined color space corresponding to the position in the display designated through the input device and the printing color gamut for the option color in the display.

9. The printing apparatus according to claim 1 , wherein the controller is configured to display labels at positions of outlines of the printing color gamut for the option color, the labels expressing that color differences between the printing color gamut and the imaging color gamut increases as the color values in the imaging color gamut are separated farther outward from the positions of the outlines by varying at least one of hue, brightness, and saturation in the display.

10. The printing apparatus according to claim 1 , wherein the controller is configured to replace a color of a pixel in the image not falling within the printing color gamut for the option color with another color by changing at least one of hue, brightness, and saturation according to a color difference between the color value of the pixel and the printing color gamut and display the image with the replaced color in the display.

11. The printing apparatus according to claim 10 , wherein the controller is configured to replace colors of pixels in the image falling within the printing color gamut for the option color with a plain color different from the another color and display the image with the replaced color and the another color in the display.

12. The printing apparatus according to claim 1 , wherein the controller is configured to display a patch chart having patches arrayed on a plane in the display, each of the patches corresponding to one of the color values of colors included in the image, the patches in the patch chart being displayed in an arrangement such that a patch corresponding to a color value not falling within the printing color gamut for the option color is distinguished from patches corresponding to the color values falling within the printing color gamut.

13. The printing apparatus according to claim 1 , wherein the controller is configured to:

convert the color values in the image data into another color value in the printing color gamut for the option color, and

display the image based on the converted another color value in the display.

14. A method for controlling a printing apparatus, the printing apparatus comprising a head having first nozzles for printing an image based on image data in inks in basic colors on a printing medium and second nozzles for printing an image based on the image data in an ink in a custom color different from the basic colors on the printing medium, first flow paths for supplying the inks in the basic colors to the first nozzles, at least one second flow path for supplying the ink in the custom color to the second nozzles, and a display, the method comprising:

acquiring an imaging color gamut, the imaging color gamut being a gamut in a predetermined color space including color values included in the image data;

for each of a plurality of option colors, acquiring a printing color gamut in the predetermined color space, the printing color gamut including color values of colors printable with the first nozzles and the second nozzles in the inks in the basic colors and the option color, one of the plurality of option colors being selectable as the custom color;

acquiring an evaluation value for each of the plurality of option colors based on a comparison between the printing color gamut and the imaging color gamut; and

before loading the at least one second flow path with the ink in the custom color, displaying a ranked order of the plurality of option colors based on the evaluation values in the display.

15. A non-transitory computer readable storage medium storing computer readable instructions that are executable by a computer configured to control a printing apparatus, the printing apparatus comprising a display and a head, the head having first nozzles for printing an image based on image data in inks in basic colors on a printing medium, second nozzles for printing an image based on the image data in an ink in a custom color different from the basic colors on the printing medium, first flow paths for supplying the inks in the basic colors to the first nozzles, and at least one second flow path for supplying the ink in the custom color to the second nozzles, the computer readable instructions, when executed by the computer, causing the computer to:

acquire an imaging color gamut, the imaging color gamut being a gamut in a predetermined color space including color values included in the image data;

for each of a plurality of option colors, acquire a printing color gamut in the predetermined color space, the printing color gamut including color values of colors printable with the first nozzles and the second nozzles in the inks in the basic colors and the option color, one of the plurality of option colors being selectable as the custom color;

acquire an evaluation value for each of the plurality of option colors based on a comparison between the printing color gamut and the imaging color gamut; and

before loading the at least one second flow path with the ink in the custom color, display a ranked order of the plurality of option colors based on the evaluation values in the display.