Download VTF Plugin Gimp/Photoshop, Edit VTF in Gimp or Photoshop

A relatively simple save options screen is used. To access VTF’s more esoteric features make your textures with VTFEdit.

There are two GIMP-specific features. You can:

• Specify a layer to use as the VTF’s alpha channel. This bypasses most problems with GIMP’s readiness to destroy the RGB data of fully-transparent pixels.
• Export each layer group to a different VTF file. Store related textures in one XCF!