imagegd2() outputs a GD2 image to filename. The image parameter is the return from the imagecreate() function.
The filename parameter is optional, and if left off, the raw image stream will be output directly.
The optional type parameter is either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.
Note: The optional chunk_size and type parameters became available in PHP 4.3.2.
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.
Note: This function requires GD 2.0.1 or later.
See also imagegd()