search for in the  
<imagefttextimagegd2>
Last updated: Thu, 19 May 2005

imagegammacorrect

(PHP 3 >= 3.0.13, PHP 4, PHP 5)

imagegammacorrect -- Apply a gamma correction to a GD image

Description

int imagegammacorrect ( resource image, float inputgamma, float outputgamma )

The imagegammacorrect() function applies gamma correction to a gd image stream (image) given an input gamma, the parameter inputgamma and an output gamma, the parameter outputgamma.



User Contributed Notes
imagegammacorrect
brian dot duncan at fife dot co dot uk
26-Jan-2002 07:46
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 ) ;
}

<imagefttextimagegd2>
 Last updated: Thu, 19 May 2005
Copyright © 2001-2005 The PHP Group
All rights reserved.
This unofficial mirror is operated at: The Server Pages
Last updated: Thu May 19 17:35:34 2005 CDT