php man page for imagegammacorrect

IMAGEGAMMACORRECT(3)							 1						      IMAGEGAMMACORRECT(3)

imagegammacorrect - Apply a gamma correction to a GD image

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

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

PARAMETERS
	      o $
		image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).

	      o $inputgamma
		- The input gamma.

	      o $outputgamma
		- The output gamma.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

EXAMPLES
       Example #1

	      imagegammacorrect(3) 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);
	      ?>

PHP Documentation Group 												      IMAGEGAMMACORRECT(3)