US 11,818,320 B2
Convert a dot area ratio of a target process color using a fluorescent color for higher brightness and saturation
Yuki Matsushima, Kanagawa (JP); and Takuroh Sawada, Tokyo (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Yuki Matsushima, Kanagawa (JP); and Takuroh Sawada, Tokyo (JP)
Filed on Apr. 14, 2021, as Appl. No. 17/230,916.
Claims priority of application No. 2020-074310 (JP), filed on Apr. 17, 2020; and application No. 2021-021180 (JP), filed on Feb. 12, 2021.
Prior Publication US 2021/0329144 A1, Oct. 21, 2021
Int. Cl. H04N 1/60 (2006.01); G01J 3/52 (2006.01)
CPC H04N 1/6025 (2013.01) [G01J 3/52 (2013.01); H04N 1/6008 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An image processing apparatus, comprising control circuitry configured to:
acquire first image data to be subjected to color conversion, wherein the first image data comprises CMYK image data; and
convert the first image data into second image data in which a dot area ratio of a target process color of process colors indicated by the first image data is distributed into a distributed dot area ratio of a fluorescent color different from the target process color and a distributed dot area ratio of the target process color, wherein a ratio between the distributed dot area ratio of the fluorescent color and the distributed dot area ratio of the target process color in the second image data is (1−α):α (0<distribution factor α<1), where the dot area ratio of the target process color indicated by the first image data is 1;
wherein the target process color has a same color system as a color system of the fluorescent color;
wherein the dot area ratio of the target process color is included in a first profile in which color values of a color space are associated with dot area ratios of the process colors;
wherein the control circuitry is configured to:
generate a second profile in which a combination of the distributed dot area ratio of the target process color and the distributed dot area ratio of the fluorescent color is associated with the color values of the color space;
convert the dot area ratios of the process colors indicated by the first image data to converted color values of the color space using the first profile; and
convert the converted color values to the dot area ratios of the process colors, including the distributed dot area ratio of the target process color and the distributed dot area ratio of the fluorescent color, using the second profile, to convert the first image data into the second image data.