imagegammacorrect
(PHP 4, PHP 5)
imagegammacorrect — Apply a gamma correction to a GD image
說明
bool imagegammacorrect
( resource
$image
, float $inputgamma
, float $outputgamma
)
Applies gamma correction to the given gd image
given an input and an output gamma.
參數
-
image -
由影像建立函式(例如imagecreatetruecolor())回傳的影像資源。
-
inputgamma -
The input gamma.
-
outputgamma -
The output gamma.
回傳值
如果成功則回傳 TRUE，失敗則回傳 FALSE。
範例
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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