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The M9 doesn't use in-camera DNG compression, but rather a square root compression algorithm that creates files that are exactly and always 1/2 the size of the original uncompressed file. This is a lossy compression scheme, but is not very processor intensive and in practice doesn't effect image quality that much. For me, I'll shoot compressed for vacation snapshots at Disney, but will switch to uncompressed for serious photo work that I may want to print really large.Interesting that they say the compressed raw format shows only minor deterioration. I wonder why there's any deterioration at all. The M9 raw files are supposed to be DNG format.
The DNG Specification's compression format is 100% lossless, but Adobe doesn't recommend it for use in camera devices because it takes a good bit of processing power to implement it.
Very interesting! Thanks.The M9 doesn't use in-camera DNG compression, but rather a square root compression algorithm that creates files that are exactly and always 1/2 the size of the original uncompressed file. This is a lossy compression scheme, but is not very processor intensive and in practice doesn't effect image quality that much. For me, I'll shoot compressed for vacation snapshots at Disney, but will switch to uncompressed for serious photo work that I may want to print really large.
The S2, incidentally, does do a lossless DNG compression in camera. It has plenty of processing horsepower and the compressed files actually make the camera shoot faster, not slower. When and if Leica updates the next M camera to use the Maestro processor like that found in the S2, I'm sure lossless compression with be on the menu.