imagegd2

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

imagegd2 — Output GD2 image to browser or file

설명

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

Outputs a GD2 image to the given to.

인수

image: imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
to: 저장할 파일 경로. 지정하지 않거나 NULL일 경우에는, raw 이미지 스트림을 직접 출력합니다.
chunk_size: Chunk size.
type: Either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.

반환값

성공 시 TRUE를, 실패 시 FALSE를 반환합니다.

변경점

버전	설명
5.4.0	Added support for passing a stream resource to `to`.

예제

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);
?>

주의

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.

참고

imagegd() - Output GD image to browser or file

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User Contributed Notes 2 notes

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Nick ¶

13 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 ¶

21 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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