Returns the index of the specified color+alpha in the palette of the
image.
Parameters
-
image
An image resource, returned by one of the image creation functions,
such as imagecreatetruecolor().
- red
Value of red component
- green
Value of green component
- blue
Value of blue component
- alpha
A value between 0
and 127
.
0
indicates completely opaque while
127
indicates completely transparent.
The colors parameters are integers between 0 and 255 or hexadecimals
between 0x00 and 0xFF.
Return Values
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.
Notes
Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).