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imagegd2> <imagefttext
Last updated: Fri, 04 Jul 2008

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imagegammacorrect

(PHP 4, PHP 5)

imagegammacorrect — Anwendung einer Gamma-Korrektur auf ein GD-Bild

Beschreibung:

int imagegammacorrect ( resource $im , double $inputgamma , double $outputgamma )

Die Funktion ImageGammaCorrect() bewirkt die Anwendung einer Gamma-Korrektur auf das mittels Bezeichner im angegebene GD-Bild. Anzugeben ist der Eingabe-Gammawert inputgamma und der Ausgabe-Gammawert outputgamma .



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imagegammacorrect
brian dot duncan at fife dot co dot uk
26-Jan-2002 05:46
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 ) ;
}

imagegd2> <imagefttext
Last updated: Fri, 04 Jul 2008
 
 
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