(PECL imagick 2, PECL imagick 3)
Imagick::cycleColormapImage — Displaces an image's colormap
Displaces an image's colormap by a given number of positions. If you cycle the colormap a number of times you can produce a psychedelic effect.
displaceThe amount to displace the colormap.
成功时返回 true。
错误时抛出 ImagickException。