Returns the index of the specified color+alpha in the palette of the image.
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.
Value of red component.
Value of green component.
Value of blue component.
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.
|8.0.0||image expects a GdImage instance now; previously, a resource was expected.|