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imagecolorexact
Description
int imagecolorexact ( resource image, int red, int green, int blue)Returns the index of the specified color in the palette of the image.
If the color does not exist in the image's palette, -1 is returned.
If you created the image from a file, only colors used in the image are resolved. Colors present only in the pallete are not resolved.
See also imagecolorclosest().