The following is a list of other alpha-related fuctions for PHP. %imagecolorallocatealpha()% - Allocate a new color in the palette with alpha information %imagecolorexactalpha()% - Match the exact color specified (including the alpha channel). %imagecolorclosestalpha()% - Match the closest color to that specified. %imagecolorresolvealpha()% - Same as %imagecolorresolve()%, except includes alpha channel.