imagefttext
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 ) ;
}
imagegammacorrect
(PHP 4, PHP 5)
imagegammacorrect — Apply a gamma correction to a GD image
Description
bool imagegammacorrect
( resource
$image
, float $inputgamma
, float $outputgamma
)
Applies gamma correction to the given gd image
given an input and an output gamma.
Parameters
-
image -
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
-
inputgamma -
The input gamma.
-
outputgamma -
The output gamma.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example #1 imagegammacorrect() usage
<?php
// Create image instance
$im = imagecreatefromgif('php.gif');
// Correct gamma, out = 1.537
imagegammacorrect($im, 1.0, 1.537);
// Save and free image
imagegif($im, './php_gamma_corrected.gif');
imagedestroy($im);
?>
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User Contributed Notes
imagegammacorrect - [1 notes]
brian dot duncan at fife dot co dot uk ¶
11 years ago