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Re: About GD Image Data Output Methodsby BrowserUk (Pope)
|on Jun 07, 2015 at 12:11 UTC||Need Help??|
->gd is libgd's own internal format. It is unlikely to be recognised by any other graphics libraries or image converters.
It is a very simple format that consists of a 11 byte header (for truecolor) and the X-width * 4 * Y-height bytes of uncompressed image data.
A simple 10x10 (truecolor) image with a diagonal line of colored pixels constructed like this:
And then output as ->gd and unpacked as bytes :
looks like this (manully formatted):
It should not be hard to knock up Perl script that converts that to one of the ASCII image formats prevalent on *nix, and then convert that to png.
Note:Palleted images have two extra bytes in the header (not sure about the purpose); a 256 * 4-byte color table following the trailer block; and then width * 1-byte * height image data, where each byte value is an index into the color table.
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