TGA File Format
The format was revised in 1989 to add support for new capabilities (thus there are "original" and "new" TGA formats). Fortunately, the "new" format is a superset of the "original", and many applications, even those designed around the "original" format, can read both types of files.
TGA files can contain monochrome images, color images with a palette, and 16 bit, 24 bit and 32 bit True Color images. 16 bit images, are usually the most commonly encountered.
TGA files can be uncompressed, or compressed using a Run-length compression scheme.
The "new" TARGA format also can store additional information, including information about when/how the file was created, application specific data, and a thumbnail version of the main image known as a "Postage-stamp image".
A technical discussion of this format can be found in Chapter 10 of Graphics File Formats† by David C. Kay and John R. Levine.
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