Image processing apparatus, image processing method and non-transitory computer readable medium for eliminating a specific color in an image

An image processing method comprising:

• eliminating a specific color in image information,
• wherein a pixel having a saturation that exceeds a saturation threshold and a lightness that is lower than a lightness threshold, which corresponds to a hue of the pixel, is not considered as an elimination target, and a pixel having a saturation that exceeds the saturation threshold and a lightness that is higher than the lightness threshold, which corresponds to a hue of the pixel, is considered as the elimination target, such that elimination target pixels are removed from the image information, and
• wherein the lightness threshold is defined based on a hue of a marking made by a marker superposed with the pixel.

A non-transitory computer readable medium storing a program causing a computer to perform a process, the process comprising:

• eliminating a specific color in image information,
• wherein a pixel having a saturation that exceeds a saturation threshold and a lightness that is lower than a lightness threshold, which corresponds to a hue of the pixel, is not considered as an elimination target and a pixel having a saturation that exceeds the saturation threshold and a lightness that is higher than the lightness threshold, which corresponds to a hue of the pixel, is considered as the elimination target such that elimination target pixels are removed from the image information, and
• wherein the lightness threshold is defined based on a hue of a marking made by a marker superposed with the pixel.