MT2 images from Indiana Jones and the Emperor's Tomb (PS2)

[wattostudios]

Hi experts.

 

I'm trying to read the MT2 images from Indiana Jones and the Emperor's Tomb (PS2), but I'm stuck trying to piece it all together.

 

The images in the PC version are 32-bit RGBA, so that's easy, and gives us a comparison.

For the same image in the PS2 version, it seems to be broken down like this...

64 bytes - basic image data (filename, width, height, etc)
width*height/2 - 4-bit pixel values (with 4bit PS2 swizzling)
width*height/8 - color values

 

This is what the pixel block looks like, as 4-bit values in grayscale:

 

The color values in the last block, look to be something similar to RGBA5551, so even though the length of this block is width*height/8, as they are 16-bit colors, there are actually only width*height/16 colors. This is what the color block looks like when read as RGBA5551 color values:

... you can see the image in that "color block". I know it's not quite the right colors, but think it might just need some color striping applied to it, or it might not be exactly RGBA5551.

 

As the width/height increase, so does the size of the color block, so it's not a plain palette, it's proportional to the image size. For example, for a 128x128 image, the color block is 2048 bytes. For a 256x256 image, the color block is 8192 bytes.

 

I'm struggling to work out how to join the "pixel" block and the "color" block together so that we end up with a usable image that looks similar to the PC image. I'm assuming maybe we need to generate some in-between colors like in a DDS image, or otherwise apply some kind of "intensity" to the colors or something like that.

 

I've never seen anything like this before - is anyone able to assist in understanding this please?

 

I have attached a ZIP with the PC image, the PS2 image file, and PNGs for both the "pixel" block and the "color" block, so you can clearly see there is a correlation between the 2 blocks.

 

Thanks for your help!

vinehead.zip

Edited 19 hours ago by wattostudios
Added images