Posted by
mahogny on
URL: http://confocal-microscopy-list.275.s1.nabble.com/Re-Ana-alarming-amount-of-image-manipulation-tp592857p1313330.html
Mario wrote:
...
> upon request. In fact, uncompressed raw image files should be provided
> to the reviewers of a paper. Might save a lot time. As for Catherine
> Verfaillie and colleagues, without knowing the details, it seems like
> a black eye on common sense on the part of U of Minn. sorry don't mean
> to offend but consider item 2.
it's about time to get this straight (mario might have just a typo here,
not claiming anything for him):
compression does NOT imply reduced image quality
but it does for sure increase the speed of disk transfer, and if you
know what you are doing, some but not all compression algorithms can
*optionally* trade high frequency information (noise) for disk space.
avoid using the terminology that "compression" destroys images because
it confuses non-experts into thinking they should be storing the images
uncompressed. there's a factor 2-10 to gain in disk space/speed for
normal images.
/Johan (who is very tired of re-teaching about compression)
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Johan Henriksson
MSc Engineering
PhD student, Karolinska Institutet
http://mahogny.areta.org http://www.endrov.net