PHP: Hypertext Preprocessor (original) (raw)
imagegammacorrect
(PHP 4, PHP 5, PHP 7, PHP 8)
imagegammacorrect — Apply a gamma correction to a GD image
Description
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](reserved.constants.php#constant.true) on success or [false](reserved.constants.php#constant.false) on failure.
Changelog
| Version | Description |
|---|---|
| 8.0.0 | image expects a GdImage instance now; previously, a valid gd 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 imagegif($im, './php_gamma_corrected.gif'); ?>
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