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 thread  Author  Topic: Manual GIF creation  (Read 539 times)
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xx Re: Manual GIF creation
« Reply #1 on: Oct 1st, 2012, 08:36am »

on Oct 1st, 2012, 02:52am, JGHarston wrote:
Can anybody help.

Not directly, but this is what I'd do in your position. Download a trusted, good, uncompressed GIF such as this:

http://upload.wikimedia.org/wikipedia/en/b/bb/Quilt_design_as_46x46_uncompressed_GIF.gif

Convert that back into whatever source format your program uses (e.g. BMP) and then create your own uncompressed GIF version. By comparing yours with the original you may be able to see what is wrong.

Richard.
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xx Re: Manual GIF creation
« Reply #2 on: Oct 8th, 2012, 12:38pm »

on Oct 1st, 2012, 08:36am, Richard Russell wrote:
Download a trusted, good, uncompressed GIF such as this: ...
He he. That's exactly what I did, ultimately ended up manually adding and removing single bytes at a time. It turns out that the documentation I was working from had a misplaced bracket, putting "Initial Code Size" as a prefix to every code block instead of as a single prefix before the first code block. uncompressed GIFs now working, so just need to get the LZW working. Compressed bitmaps were so much easier, just simple run-length encoding smiley
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