(PHP 4, PHP 5, PHP 7, PHP 8)
imagegammacorrect — Apply a gamma correction to a GD image
Applies gamma correction to the given gd image
given an input and an output gamma.
imageA GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor() .
input_gammaThe input gamma.
output_gammaThe output gamma.
| Version | Description |
|---|---|
| 8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
Example #1 imagegammacorrect() usage
<?php
// Create image instance
$im = imagecreatefromgif('php.gif');
// Correct gamma, out = 1.537
imagegammacorrect($im, 1.0, 1.537);
// Save
imagegif($im, './php_gamma_corrected.gif');
?>