imagegammacorrect
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
imagegd2
(PHP 4 >= 4.0.7, PHP 5)
imagegd2 — Output GD2 image to browser or file
Popis
bool imagegd2 ( resource $image [, string $filename [, int $chunk_size [, int $type]]] )Outputs a GD2 image to the given filename.
Seznam parametrů
- image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- filename
The path to the saved file. If not set or NULL, the raw image stream will be outputed directly.
- chunk_size
- type
Either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.
Návratové hodnoty
Vrací TRUE při úspěchu, FALSE při selhání.
Poznámky
Poznámka: Tato funkce vyžaduje GD 2.0.1 nebo novější (doporučena verze 2.0.28 nebo novější).
Poznámka: 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 (záznam změn)
| Verze | Popis |
|---|---|
| 4.3.2 | chunk_size and type were added. |
Viz také
| imagegd() |
add a note
User Contributed Notesimagegd2
mark at teckis dot com
16-Apr-2003 06:33
16-Apr-2003 06:33
mysterium at gmx _spamsux_ dot ch
11-Feb-2003 02:35
11-Feb-2003 02:35
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.