Color processing method, color processing apparatus, and storage medium

A color processing apparatus for adjusting colors of a specific region, which is a subject of the adjustment in a color image, the color processing apparatus comprising:

• a color adjustment distance calculation section of a computer that calculates a color adjustment distance, which is an Euclidean distance in a color space between a representative color defined in the color space representing the specific region in the color image and a target color, which is target of the adjustment and also defined in the color space, on the basis of the representative color and the target color;
• and
• a reproduction color decision section of a computer that decides a reproduction color expressing the representative color of the specific region after the adjustment on the basis of the color adjustment distance, wherein the reproduction color is located in the color space between the representative color and the target color, and the reproduction color having a reproduction distance, which is a distance between the representative color and the reproduction color, wherein
• the reproduction distance increases with increase in the color adjustment distance when the color adjustment distance is smaller than a certain value and decreases with increase in the color adjustment distance when the color adjustment distance is larger than the certain value.

A color processing apparatus for adjusting colors of a specific region, which is a subject of the adjustment in a color image, the color processing apparatus comprising:

• a color adjustment distance calculation unit of a computer that calculates a color adjustment distance, which is an Euclidean distance in a color space between a representative color in the color space representing the specific region in the color image and a target color, which is a target of the adjustment and also defined in the color space, on the basis of the representative color and the target color;
• a reproduction distance coefficient calculation unit of a computer that calculates a reproduction distance coefficient, which is used to calculate a reproduction color in the color space expressing the representative color of the specific region after color adjustment, on the basis of the color adjustment distance, the reproduction distance coefficient being a distance between the representative color and the reproduction color;
• and
• a reproduction color calculation unit of a computer that calculates the reproduction color on the basis of the color adjustment distance and the reproduction distance coefficient, wherein the reproduction distance coefficient increases with increase in the color adjustment distance when the color adjustment distance is smaller than a certain distance and decreases with increase in the color adjustment distance when the color adjustment distance is larger than the certain value.

A storage medium for storing a program readable by a computer, the program making the computer execute a color process for adjusting colors of a specific region, which is a subject of color adjustment in a color image, wherein the program making the computer execute a color processing comprising:

• calculating a color adjustment distance, which is an Euclidean distance in a color space between a representative color in the color space representing the specific region in the color image and a target color, which is target of the adjustment and also defined in the color space, on the basis of the representative color and the target color;
• and
• deciding a reproduction color in the color space expressing the representative color of the specific region after the adjustment on the basis of the color adjustment distance, the reproduction color being located in the color space between the representative color and the target color, and the reproduction color having a reproduction distance, which is a distance between the representative color and the reproduction color, wherein
• the reproduction distance increases with an increase in the color adjustment distance when the color adjustment distance is smaller than a certain value and decreases with increase in the color adjustment distance when the color adjustment distance is larger than the certain value.

A printer comprising:

• a color processing device, including a computer, for adjusting colors of a specific region, which is a subject of the adjustment in a color image, wherein the color processing device includes:
• a color adjustment distance calculation section that calculates a color adjustment distance, which is an Euclidean distance in a color space between a representative color in the color space representing the specific region in the color image and a target color, which is a target of the adjustment and also defined in the color space, on the basis of the representative color and the target color;
• and
• a reproduction color decision section that decides a reproduction color in the color space expressing the representative color of the specific region after the adjustment on the basis of the color adjustment distance, wherein the reproduction color is located in the color space between the representative color and the target color, and the reproduction color having a reproduction distance, which is a distance between the representative color and the reproduction color,
• wherein the reproduction distance increases with increase in the color adjustment distance when the color adjustment distance is smaller than a certain value and decreases with increase in the color adjustment distance when the color adjustment distance is larger than the certain value.