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AcquireImageColormap
AcquireImageColormap() allocates an image colormap and initializes it to a linear gray colorspace. If the image already has a colormap, it is replaced. AcquireImageColormap() returns MagickTrue if successful, otherwise MagickFalse if there is not enough memory.
The format of the AcquireImageColormap method is:
MagickBooleanType AcquireImageColormap(Image *image,
const size_t colors)
A description of each parameter follows:
image
the image.
colors
the number of colors in the image colormap.
CycleColormap
CycleColormap() displaces an image's colormap by a given number of positions. If you cycle the colormap a number of times you can produce a psychodelic effect.
The format of the CycleColormapImage method is:
MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace)
A description of each parameter follows:
image
the image.
displace
displace the colormap this amount.