imagegd2

(PHP 4 >= 4.0.7, PHP 5)

imagegd2 — Output GD2 image to browser or file

Description

bool imagegd2 ( resource $image [, string $filename [, int $chunk_size [, int $type ]]] )

Outputs a GD2 image to the given filename .

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
filename: The path to save the file to. If not set or NULL, the raw image stream will be outputted directly.
chunk_size: Chunk size.
type: Either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 Outputting a GD2 image


<?php
// Create a blank image and add some text
$im = imagecreatetruecolor(120, 20);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 1, 5, 5,  "A Simple Text String", $text_color);

imagegd2($im);

// Free up memory
imagedestroy($im);
?>

Example #2 Saving a GD2 image


<?php
// Create a blank image and add some text
$im = imagecreatetruecolor(120, 20);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 1, 5, 5,  "A Simple Text String", $text_color);

// Save the gd2 image
// The file format for GD2 images is .gd2, see http://www.libgd.org/GdFileFormats
imagegd2($im, 'simple.gd');

// Free up memory
imagedestroy($im);
?>

Notes

Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).

Note: The GD2 format is commonly used to allow fast loading of parts of images. Note that the GD2 format is only usable in GD2-compatible applications.

Changelog

Version	Description
4.3.2	`chunk_size` and `type` were added.


yes, the gd2 file format does improve the speed of image creations as the data-setup is designed to be native for the GD function - ie, the image doesn't have to be converted to a usable format prior to processing.



you may also note that the newer gd2 format creates much smaller size files than the older imagegd function, certainly for images involving chunks of single colours anyway. you'll probably find this function most useful for saving overlay images or background images used in larger image creation scripts.



to read a ping or jpeg image (.png / .jpg) and save a .gd2 version to server...



$img = $_GET['img'];

if(file_exists($img))

    {

    $dim = getimagesize($img);

    $cr = ($dim[2] < 4) ? ($dim[2] < 3) ? ($dim[2] < 2) ? NULL : imagecreatefromjpeg($img) : imagecreatefrompng($img) : Null;

    if($cr !== NULL)

          {

         imagegd2($cr,substr($img,0,strrpos($img,'.')).'.gd2');

          }

    }



should save a copy with the same filename and directory using extension .gd2 - which can then be nicely and swiftly read using either imagecreatefromgd2 or imagecreatefromgd2part

mysterium at gmx _spamsux_ dot ch
11-Feb-2003 07:35


A little more information: http://www.boutell.com/gd/manual2.0.11.html#gdImageGd2



For me, the gd2 format is intended for faster loading and writing. I didn't test this yet.

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Last updated: Fri, 20 Nov 2009