Ahh, yes, I remember bringing that up on my little mini-guide on GodFed's first post of the topic:Hey, sorry for bringing this up again, but I've noticed that all _0 - _3 textures are red and black. I mention this because in S.'s texture dumps, he made them all Black and White. Is there a specific reason for this? Also, It's next to impossible to find offsets for these images. While they have the exact same patterns in their hex, the numbers and digits don't match at all, and I had to manually browse to find them. Does converting them to B & W make it easier?
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_0.tga = I4
_1.tga = I8
_2.tga = IA4
_3.tga = IA8
~The textures above are generally black-and-white files, so keep an eye out for that.~
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If anything, the B&W files should be the easiest to locate; they're normally a cinch for me to find, as they match up very well with their originals.
...But, in some cases, as you said, they can be very difficult (if they don't have transparency involved, anyway).
For you, have you tried taking mere bits and pieces of the files as you search, instead of chunks? I find that to be just as effective, as most files have unique hex patterns and will only show up a few times throughout the file(s). From there, it's simply matching up those patters in the file, with those in your custom file you want to insert.