imagegammacorrect
(PHP 4, PHP 5, PHP 7)
imagegammacorrect — Apply a gamma correction to a GD image
Description
imagegammacorrect ( resource $image , float $inputgamma , float $outputgamma ) : bool
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);
?>
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https://www.php.net/manual/en/function.imagegammacorrect.php