Module colormap Methods

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.