Yes, the tutorial is old. pngs are a much better option. Rather than trying to match the brown, you should use true transparency in the png. There are lots of new techniques, that developed over time, that aren't explained on that page, but all the information is here on Vogons in various threads. If the project goes well, I can tell you how to translate the results into a pack for TombATI, or I may be able to do it for you. Would be great to have another pack. Be warned though, it's a lot of work.

I'll be sure to study the forums as much as I can. As for it being a big undertaking, I found that out just a little while after I started capturing stuff. Lara's Home and the Title Screen alone have around 430(?) seperate textures!

Heck, I spent [REDACTED] hours working on the main hall's floor tile texture, only to find that:

a) It doesn't quite align properly
b) The use of dark blue rather than actual black was probably a deliberate choice on the devs part, and something I should try to emulate.

I have a feeling that this'll be a pretty long project, but at the moment, I'm still looking forward to it. 😀

Looks like that image may have been captured with a slight perspective transformation applied to it. Gimp has tools to alter things like that.

Glidos wrote on 2020-05-03, 08:18:

Looks like that image may have been captured with a slight perspective transformation applied to it. Gimp has tools to alter things like that.

I really do need to look into Gimp more. 😀

Also, I wanted to double-check - is the maximum resolution for individual textures still 256 x 256? I'm asking because, while it's a vast improvement from the originals (some of which are around 30x30), a lot of tutorials I'm finding for how to draw textures keep mentioning that they recommend an image's file size should be around 500x500, or sometimes 1080x1080. I'm fine with making things that're 256 x 256, I'm just worried that in a year or two, it'll suddenly be "below par".

Yes 256x256 is the maximum. The overriding of textures is done by Glidos, not the selected Glide wrapper, so it has to stay within Glide limits and 256x256 is a Glide limit.

Welp, looks like I'm coming back to this old idea for a bit!

I wanted to ask, with the "air bubble" textures ((80--136)(40--96).bmp and (176--232)(0--56).bmp), is there any discernible difference between them? What are they used for, exactly?

Because I can tell that they're the bubbles that come from Lara as she swims, but I can't figure out why there'd be two of them!

You could replace them temporarily with something weird and see where in the game they appear.