imagegd2

(PHP 4 >= 4.0.7, PHP 5, PHP 7)

imagegd2Output GD2 image to browser or file

Opis

imagegd2 ( resource $image [, mixed $to = NULL [, int $chunk_size = 128 [, int $type = IMG_GD2_RAW ]]] ) : bool

Outputs a GD2 image to the given to.

Parametry

obraz

Zasób obrazu, zwrócony przez jedną z funkcji tworzących obrazy, taką jak imagecreatetruecolor().

to

Ścieżka do zapisu pliku. Jeśli nie jest ustawiona lub ma wartość NULL, obraz zostanie przesłany bezpośrednio na wyjście.

chunk_size

Chunk size.

type

Either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.

Zwracane wartości

Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.

Uwaga

However, if libgd fails to output the image, this function returns TRUE.

Rejestr zmian

Wersja Opis
5.4.0 Added support for passing a stream resource to to.

Przykłady

Przykład #1 Outputting a GD2 image

<?php
// Create a blank image and add some text
$im imagecreatetruecolor(12020);
$text_color imagecolorallocate($im2331491);
imagestring($im155,  "A Simple Text String"$text_color);

// Output the image
imagegd2($im);

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

Przykład #2 Saving a GD2 image

<?php
// Create a blank image and add some text
$im imagecreatetruecolor(12020);
$text_color imagecolorallocate($im2331491);
imagestring($im155,  "A Simple Text String"$text_color);

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

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

Notatki

Informacja:

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.

Ostrzeżenie

The GD and GD2 image formats are proprietary image formats of libgd. They have to be regarded obsolete, and should only be used for development and testing purposes.

Zobacz też:

  • imagegd() - Output GD image to browser or file

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User Contributed Notes 2 notes

up
1
Nick
9 years ago
You can use this function in combination with imagecreatefromstring() to clone the gd resource with minimum fuss (no writing to tmp file):

<?php
function cloneGd($gd)
{
   
ob_start();
   
imagegd2($gd);
    return
imagecreatefromstring(ob_get_clean());
}
?>
up
0
mark at teckis dot com
17 years ago
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
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