[3dem] Data storage and compression
Takanori Nakane
tnakane at mrc-lmb.cam.ac.uk
Fri Aug 30 00:00:25 PDT 2019
Hi,
> (1) I think libtiff has supported building with Zstandard support for a
> bit (though it is not a common compilation option). My guess is
> TIFF+ZStandard will do quite a bit better in the general-case
> compression dept. than LZW. Does anyone expect that software packages
> would automatically work with such images if I built libtiff with
> Zstandard and linked against it? I suppose I could just try it, but
> have not had the chance yet…
RELION does not assume anything about TIFF compression.
As long as the linked libtiff supports it, it should work.
> (2) For cameras like the F3 that output movies with gains pre-applied-
> it would seem some amount of lossy compression is required to achieve
> reasonable compression savings- has anyone looked at using
> “error-bounded” lossy compression algorithms in this use case? My very
> naive attempt at quantizing the pixel values (drop 5 LSB) was promising
> but needs a lot more characterization:
This probably depends on how close you are to the physical Nyquist.
Best regards,
Takanori Nakane
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