(PHP 4, PHP 5, PHP 7)
imagegammacorrect — Apply a gamma correction to a GD image
imagegammacorrect ( resource $image , float $inputgamma , float $outputgamma ) : bool
Applies gamma correction to the given gd image
given an input and an output gamma.
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
inputgamma
The input gamma.
outputgamma
The output gamma.
Returns true
on success or false
on failure.
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