lossless compression of still images - recommendations?

Karl Auer kauer at biplane.com.au
Sun Feb 19 21:34:22 UTC 2017


On Sun, 2017-02-19 at 16:28 +0000, Jonesy wrote:
> Ya, but.  I wonder if the "unchanging" regions in the various images 
> result in identical JPEG encoding.  It would only take the slightest 
> variation in light intensity to render regions totally different -- 
> especially if very high resolution images are sought.

If that's the case for the OP then he is out of luck. Compression
algorithms can't compress the incompressible. However, remember that
the algorithms don't care where the similar bits are - they just want
identical sequences. Even quite short repeated sequences, if there are
a lot of them and happen a lot, can result in significant compression.

This is why the OP should try things out - different compression
programs particularly.

Regards, K.

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