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LSL Wiki : TGA

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Developed by Truevision, Inc., Targa, aka TGA, is a bitmapped graphics format, usually uncompressed, that supports an alpha channel. Second Life can import both 24-bit (no alpha) and 32-bit (alpha) TGA files. This format is the graphical workhorse of the SL garment industry.

Avoid using the 32-bit format if the texture doesn't have/need any transparency; otherwise there might be unwanted visual effects.

Note that SL doesn't use TGA files, but actually JPEG2000. TGA files are converted to JPEG2000 and uploaded in JPEG2000 format to the asset server. Texture data is downloaded as JPEG2000 and decompressed directly into memory on the client.

Wikipedia: TGA

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