imagegammacorrect

(PHP 4, PHP 5)

imagegammacorrect — 对 GD 图像应用 gamma 修正

说明

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

imagegammacorrect() 函数用给定的输入 gamma 值 inputgamma 和输出 gamma 值 outputgamma 对一幅 GD 图像流（image ）应用 gamma 修正。

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imagegammacorrect

brian dot duncan at fife dot co dot uk
26-Jan-2002 09:46


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: Mon, 26 Nov 2007