IMAGEGAMMACORRECT(3) 1 IMAGEGAMMACORRECT(3)
imagegammacorrect - Apply a gamma correction to a GD image
SYNOPSIS
bool imagegammacorrect (resource $image, float $inputgamma, float $outputgamma)
DESCRIPTION
Applies gamma correction to the given gd $image given an input and an output gamma.
PARAMETERS
o $
image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).
o $inputgamma
- The input gamma.
o $outputgamma
- The output gamma.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
imagegammacorrect(3) 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);
?>
PHP Documentation Group IMAGEGAMMACORRECT(3)
