This game is by Raw Thrills and uses the same engine as Winter X-Games Snocross, which I found an Noesis script made by Durik256 for. The texture format is "IMG". TextureFinder doesn't seem to get anything intelligible. Here's some samples:

00000553.zip

Edited December 17, 20232 yr by HorsePlant

Can you decompress the IDAT chunk? Maybe (given the same engine) it uses the same compression as Winter X-Games Snocross? TextureFinder (and the other generic graphics viewers here) just display textures and don't know anything about game-specific compression. Presumably the two uint32's after IDAT are the uncompressed and compressed byte length of the chunk. Despite the similarity in name to the PNG IDAT chunk, it's not PNG because in PNG, the length comes before the fourCC.

Edited December 17, 20232 yr by piken
Add PNG comment.

I research this a little, compression TDCB_lzw15v (in qbms)

structure:

4BYTE magic(IMG )
UINT dataOFs?
UINT width
UINT height
UINT unk(pixel type?)
UINT numMipMap?
8BYTE chunkLabel(\x00\x00ММIDAT)
UINT chunkSize
while numMipMap:
	UINT pixelSize

UINT chunkLabel(IEOF\x00\x00\x00\x00)

EDIT: i made plugin for qbms and Noesis fmt_UIMG.py

unpack *.IMG using qbms to *.UIMG, and open in Noesis

Edited January 2, 20242 yr by Durik256

you're my hero, thanks 😁

HorsePlant: If there are no remaining questions, want to click "Mark as Solution" on Durik's post? (it helps when looking at the list of active posts to know ones are solved already vs which are not)

Edited March 25, 20242 yr by piken