php man page for imagecolorresolve

IMAGECOLORRESOLVE(3)							 1						      IMAGECOLORRESOLVE(3)

imagecolorresolve - Get the index of the specified color or its closest possible alternative

SYNOPSIS
       int imagecolorresolve (resource	$image, int  $red, int	$green, int  $blue)

DESCRIPTION
	This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.

       If you created the image from a file, only colors used in the image are resolved. Colors present only in the palette are not resolved.

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

	      o $red
		-Value of red component.

	      o $green
		-Value of green component.

	      o $blue
		-Value of blue component.

RETURN VALUES
	Returns a color index.

EXAMPLES
       Example #1

	      Using imagecoloresolve(3) to get colors from an image

	      <?php
	      // Load an image
	      $im = imagecreatefromgif('phplogo.gif');

	      // Get closest colors from the image
	      $colors = array();
	      $colors[] = imagecolorresolve($im, 255, 255, 255);
	      $colors[] = imagecolorresolve($im, 0, 0, 200);

	      // Output
	      print_r($colors);

	      imagedestroy($im);
	      ?>

	      The above example will output something similar to:

	      Array
	      (
		  [0] => 89
		  [1] => 85
	      )

SEE ALSO
       imagecolorclosest(3).

PHP Documentation Group 												      IMAGECOLORRESOLVE(3)