(PECL imagick 2.0.0)
Imagick::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.
displaceThe amount to displace the colormap.
   Returns TRUE on success.
  
Throws ImagickException on error.