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(PECL gmagick >= Unknown)
Gmagick::cyclecolormapimage — Displaces an image's colormap
$displace
)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.
displace
The amount to displace the colormap.
Returns self on success.
错误时抛出 GmagickException。