SRW format isn't very compressible

Started Oct 20, 2011 | Discussions thread
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thielges
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SRW format isn't very compressible
Oct 20, 2011

Just for fun I tried running a few ISO 80 EX1 .SRW files through a run of the mill lossless compressor (gzip). The results were not very promising with an average compression of about 18%.

This leads me to believe that one or both of the following are true:

1) there's a lot of noise in the lower order bits (which gzip would not compress away)

2) other competing sensors also have a low of lower order bit noise, but either truncate the lower order bits or apply some form of basic noise suppression before RAW file generation.

Just some food for thought. If Samsung sensors are as noisy as competitive sensors then their RAW format contains slightly more information compared to the competition, potentially recoverable in post processing. Whether that slightly higher info content is worth the larger RAW files is a different question.

Incidentally the Unix "file" command reports that the .SRW file is a TIFF format:

$ file SAM_2619.SRW
SAM_2619.SRW: TIFF image data, big-endian

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