(PECL gmagick >= Unknown)
Gmagick::mapimage — Replaces the colors of an image with the closest color from a reference image
Replaces the colors of an image with the closest color from a reference image.
gmagickThe reference image.
ditherSet this integer value to something other than zero to dither the mapped image.
The Gmagick object.
错误时抛出 GmagickException。