Definitions for "perceptual"
A rendering intent used to convert out of gamut colors. If out of gamut colors are encountered, the Perceptual intent will shift both in gamut and out of gamut colors so as best to preserve the visual relationship between the colors while remapping out of gamut colors to a color that is in gamut in the destination color space. To learn more about the Perceptual rendering intent, click here.
of or relating to the act of perceiving; "perceptual stimulus"