PLT files - Packed Layer Textures - offer support for multiple layers and are used for tintable armor parts for player character. They can be interpreted as 10 grayscale textures, which can then be tinted separately.
Some PLT tools:
- GIMP PLT Plugin - python plugin for saving and loading in GIMP
- Bioware PLT Photoshop Exporter
- PLT Editor - Basic editor for PLT files, can batch convert to/from BMP
PLT Files Basics
You basically have a standard TGA-like image, but with a number of "layers" - these layers don't really overlap they merely represent which colour option affects which pixel.
The easiest way to edit them is likely the GIMP plugin where the layers for each colour selection can be generated, and thus cutout portions of which part of the image should be tied to which layer can be done.
File Format Information
PLTs are binary files consisting of a 24 byte header and an image data block. The image data consist of 2 bytes per pixel, each representing a (color, layer) tuple.
|. . .|
Valid layer Ids