imagegammacorrect

(PHP 4, PHP 5)

imagegammacorrect — Apply a gamma correction to a GD image

Beskrivelse

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

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

Parameterliste

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
inputgamma: The input gamma
outputgamma: The output gamma

Returneringsværdier

Returnerer TRUE ved succes, FALSE ved fejl.

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imagegammacorrect

brian dot duncan at fife dot co dot uk
26-Jan-2002 01:46


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 ) ;

}

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Last updated: Sun, 25 Nov 2007