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imagetruecolortopalette

Convert a true color image to a palette image (PHP 4 >= 4.0.6, PHP 5)
bool imagetruecolortopalette ( resource image, bool dither, int ncolors )

imagetruecolortopalette() converts a truecolor image to a palette image. The code for this function was originally drawn from the Independent JPEG Group library code, which is excellent. The code has been modified to preserve as much alpha channel information as possible in the resulting palette, in addition to preserving colors as well as possible. This does not work as well as might be hoped. It is usually best to simply produce a truecolor output image instead, which guarantees the highest output quality.

Parameters

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

dither

Indicates if the image should be dithered - if it is TRUE then dithering will be used which will result in a more speckled image but with better color approximation.

ncolors

Sets the maximum number of colors that should be retained in the palette.

Return Values

Returns TRUE on success or FALSE on failure.

Notes

Note:

This function requires GD 2.0.1 or later (2.0.28 or later is recommended).