imagegd2

(PHP 4 >= 4.0.7, PHP 5)

imagegd2 — Output GD2 image to browser or file

Descrizione

bool imagegd2 ( resource $image [, string $filename [, int $chunk_size [, int $type = IMG_GD2_RAW ]]] )

Outputs a GD2 image to the given filename.

Elenco dei parametri

image: Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().
filename: Il percorso in cui salvare il file. Se non è impostato o è NULL, viene restituito il flusso raw dell'immagine.
chunk_size: Chunk size.
type: Either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Esempi

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);

// Output the image
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.gd2');

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

Note

Nota: Questa funzione necessita di GD 2.0.1 o successivi (raccomandato 2.0.28 o successivi).

Nota:
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.

Log delle modifiche

Versione	Descrizione
4.3.2	`chunk_size` and `type` were added.

Vedere anche:

imagegd() - Output GD image to browser or file

add a note User Contributed Notes imagegd2 - [2 notes]

down

Nick ¶

2 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());

}

?>

down

mark at teckis dot com ¶

10 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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