(PHP 4, PHP 5, PHP 7)
Apply a gamma correction to a GD image
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.
Returns:
Returns TRUE on success or FALSE on failure.
Examples:
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);
?>
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