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Re:Let's Build an MP3 Decoder by nodata on Monday February 06, 2012 @02:55AM (#3556616)
Lossless: zip/unzip.

Lossy: jpeg.

Re:Let's Build an MP3 Decoder by getsat on Monday February 06, 2012 @03:43AM (#3556695)
Or:

Lossless: PNG

Lossy: JPEG