Description
int
imagecolorexactalpha ( resource image, int red, int green, int blue, int alpha )
Returns the index of the specified color+alpha in the palette of the
image.
If the color does not exist in the image's palette, -1 is
returned.
Замечание: Эта функция нуждается в GD версии 2.0.1 или выше.
See also imagecolorclosestalpha().