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Interested in reversing 2d-image formats
https://zenhax.com/viewtopic.php?f=7&t=7208
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Author:  Anexenaumoon [ Sat Jan 13, 2018 3:56 am ]
Post subject:  Interested in reversing 2d-image formats

Hey guys, I don't know who can help me (most likely Acewell can get me started, I don't really know xD), but I'm interested in learning how to reverse 2-d image formats. Does anyone have any pointers on where I can start learning how to/examples to trace of how it's done? I have a basic understanding in archives, and I'm looking to expand my knowledge into textures/image formats. Can anyone offer up some advice for a noobie like me?

Author:  TheUkrainianBard [ Sat Jan 13, 2018 10:58 am ]
Post subject:  Re: Interested in reversing 2d-image formats

It depends on engine used and platform it was developed for but I'd say it starts with data and visual patterns.
There aren't that many de-facto used compression schemes for textures with BC (Block Compression, aka DXTC or S3TC) being the most ubiquitous.

Author:  Acewell [ Sun Jan 14, 2018 12:04 am ]
Post subject:  Re: Interested in reversing 2d-image formats

i have about a hundred scripts in their simplest form floating around you can reference along with samples provided in the same threads. :)
you can apply same steps you know from archive extraction to figuring out image formats.
in the headers i look for any combination of width, height, some kind of format ID and datasize.
i usually start with opening samples in TextureFinder to see if anything displays on a common format,
then if no satisfying results i will use Noesis built-in format functionality to identify anything exotic.
and from there just start forming a script and let the tools do the work, not a whole lot to it. :D

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