PHP 8.1.0 Released!

imagegammacorrect

(PHP 4, PHP 5, PHP 7, PHP 8)

imagegammacorrectApply 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($im1.01.537);

// Save and free image
imagegif($im'./php_gamma_corrected.gif');
imagedestroy($im);
?>

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