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[edit] Last updated: Fri, 17 May 2013

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imagegammacorrect

(PHP 4, PHP 5)

imagegammacorrectApply a gamma correction to a GD image

Descrierea

bool imagegammacorrect ( resource $image , float $inputgamma , float $outputgamma )

Applies gamma correction to the given gd image given an input and an output gamma.

Parametri

image

O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().

inputgamma

The input gamma.

outputgamma

The output gamma.

Valorile întoarse

Întoarce valoarea TRUE în cazul succesului sau FALSE în cazul eșecului.

Exemple

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);
?>



add a note add a note User Contributed Notes imagegammacorrect - [1 notes]
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-1
brian dot duncan at fife dot co dot uk
11 years ago
Just thought I'd add how I used the gamma correction function (seeing as no-one had done so previously).  works great.

I used a form which has a parameter $GAMMA, so I usually type in something like 1.6

$image = ImageCreateFromJpeg ( "pictures/".$PICTURE2 ) ;
if ($GAMMA != "")
{
    $GammaFloat = (double) $GAMMA ;
    imagegammacorrect ($image, 1.0, $GammaFloat ) ;
        // now save the file
    imagejpeg ( $image, "pictures/"."$PICTURE2", 90 ) ;
}

 
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