Php/docs/function.imagecolorexactalpha
imagecolorexactalpha
(PHP 4 >= 4.0.6, PHP 5, PHP 7)
imagecolorexactalpha — Get the index of the specified color + alpha
Description
imagecolorexactalpha
( resource $image
, int $red
, int $green
, int $blue
, int $alpha
) : int
Returns the index of the specified color+alpha in the palette of the image.
Parameters
image
- An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
red
- Value of red component.
green
- Value of green component.
blue
- Value of blue component.
alpha
- A value between
0
and127
.0
indicates completely opaque while127
indicates completely transparent.
The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.
Return Values
Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.
Examples
Example #1 Get colors from the GD logo
<?php// Setup an image$im = imagecreatefrompng('./gdlogo.png');$colors = Array();$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);print_r($colors);// Free from memoryimagedestroy($im);?>
The above example will output something similar to:
Array ( [0] => 16711680 [1] => 2130706432 [2] => 939524095 [3] => 342163252 )
See Also
- imagecolorclosestalpha() - Get the index of the closest color to the specified color + alpha