imagecolorexactalpha
(PHP 4 >= 4.0.6, PHP 5, PHP 7)
imagecolorexactalpha — Get the index of the specified color + alpha
Description
$image
, int $red
, int $green
, int $blue
, int $alpha
) : intReturns 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.
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($colors);
// Free from memory
imagedestroy($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
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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