php man page for imagepng

IMAGEPNG(3)								 1							       IMAGEPNG(3)

imagepng - Output a PNG image to either the browser or a file

SYNOPSIS
       bool imagepng (resource	$image, [string  $filename], [int  $quality], [int  $filters])

DESCRIPTION
	Outputs or saves a PNG image from the given $image.

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

	      o $filename
		-The path to save the file to. If not set or NULL, the raw image stream will be outputted directly.

	      Note

		     NULL is invalid if the $quality and $filters arguments are not used.

	      o $quality
		- Compression level: from 0 (no compression) to 9.

	      o $filters
		-  Allows  reducing  the PNG file size. It is a bitmask field which may be set to any combination of the PNG_FILTER_XXX constants.
		PNG_NO_FILTER or PNG_ALL_FILTERS may also be used to respectively disable or activate all filters.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

CHANGELOG
       +--------+--------------------------------+
       |Version |				 |
       |	|				 |
       |	|	   Description		 |
       |	|				 |
       +--------+--------------------------------+
       | 5.1.3	|				 |
       |	|				 |
       |	|  Added the $filters parameter. |
       |	|				 |
       | 5.1.2	|				 |
       |	|				 |
       |	|  Added the $quality parameter. |
       |	|				 |
       +--------+--------------------------------+
EXAMPLES
       <?php
       $im = imagecreatefrompng("test.png");

       header('Content-Type: image/png');

       imagepng($im);
       imagedestroy($im);
       ?>

SEE ALSO
       imagegif(3), imagewbmp(3), imagejpeg(3), imagetypes(3), imagesavealpha(3).

PHP Documentation Group 													       IMAGEPNG(3)