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JPEG output: enable optimized coding
Add OPTIMIZED=YES/NO/ARITHMETIC (default YES) format option to turn on optimized Huffman coding. If set to NO, use standard Huffman tables (a little bit faster in theory, but less efficient for output size). If set to ARITHMETIC, will use Arithmetic entropy coding instead of Huffman, for smaller size. Note that Arithmetic coding/decoding is available in libjpeg-turbo implementation, but not in IJG libjpeg-6b or later. So must only be used in combinations with clients that are known to be able to decode Arithmetic encoded JPEG.
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