Open manually; may be referenced by an application
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Bitmap image format developed by Truevision (now Pinnacle Systems) in 1984 for use with its first video products; new extensions to the TGA file were introduced by Truevision in 1989 to accommodate the needs of graphics industry professionals.
Examples of the extra extensions include:
A scaled-down postage stamp copy of the image (a "thumbnail" image)
Date and time the file was created
Author name and comments
Pixel aspect ratio
Alpha channel type
TGA files are also often used for storing texture files referenced by 3D video games.