When one viewing condition parameter is applied to all pixels, a visual
effect between a single color and a background expressed on a rasterized
image cannot be reflected on a color matching result. To prevent this,
when color matching using a human color appearance model is to be
performed, the distance between an image and a viewer and the resolution
of the image are input. On the basis of the input distance and resolution,
a stimulus region, adjacent region, and background region based on a
plurality of field angles (e.g., 2.degree., 4.degree., and 10.degree.) for
a pixel of interest on the image are defined, thereby determining a
viewing condition parameter and performing color matching.
