tga

The Targa (TGA) format is designed for systems using the Truevision video board and is commonly supported by MS-DOS color applications. Targa format supports 16-bit RGB images (5 bits x 3 color channels, plus one unused bit), 24-bit RGB images (8 bits x 3 color channels), and 32-bit RGB images (8 bits x 3 color channels plus a single 8-bit alpha channel). Targa format also supports indexed-color and grayscale images without alpha channels. When saving an RGB image in this format, you can choose a pixel depth and select RLE encoding to compress the image.

Specification	Truevision TGA — Version 2.0, from Paul Bourke
Library	None
Copyright	Internal
Samples	here

File	Features	Pixel format
gray8.tga	gray 8-bit	LAub
gray8-rle.tga	gray 8-bit with RLE compression	LAub
rgb8.tga	RGB indexed	RGBub
rgb8-rle.tga	RGB indexed with RLE compression	RGBub
rgb16.tga	16-bit (1x5x5x5) RGB	RGBub
rgb16.tga	16-bit (1x5x5x5) RGB with RLE compression	RGBub
rgb24.tga	24-bit RGB (8x8x8)	RGBub
rgb24-rle.tga	24-bit RGB (8x8x8) with RLE compression	RGBub
rgba32.tga	32-bit RGBA (8x8x8x8)	RGBAub