imagegammacorrect
(PHP 4, PHP 5, PHP 7, PHP 8)
imagegammacorrect — Apply a gamma correction to a GD image
Description
imagegammacorrect(GdImage $image, float $input_gamma, float $output_gamma): bool
Applies gamma correction to the given gd image
given an input and an output gamma.
Parameters
-
image
-
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
-
input_gamma
-
The input gamma.
-
output_gamma
-
The output gamma.
Return Values
Returns true
on success or false
on failure.
Changelog
Version | Description |
---|---|
8.0.0 | image expects a GdImage instance now; previously, a resource was expected. |
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