imagegammacorrect
(PHP 4, PHP 5)
imagegammacorrect — Apply a gamma correction to a GD image
Description
bool imagegammacorrect
( resource $image
, float $inputgamma
, float $outputgamma
)
Applies gamma correction to the given gd image given an input and an output gamma.
Parameters
- image
-
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- inputgamma
-
The input gamma.
- outputgamma
-
The output gamma.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example #1 imagegammacorrect() usage
<?php
// Create image instance
$im = imagecreatefromgif('php.gif');
// Correct gamma, out = 1.537
imagegammacorrect($im, 1.0, 1.537);
// Save and free image
imagegif($im, './php_gamma_corrected.gif');
imagedestroy($im);
?>