Rob wrote:
>Lynn wrote:
> > "Compression" starts breaking down when: 1)there is too much texture, or
>2)colors are "flat" but not quite the same.
>
>And "texture" may be in the form of grain or apparent grain.
Oh, most definitely!!
>My scans of Fuji 800 compress really poorly, while Provia 100F scans
> >compress far better. Compression generally works well if there is
> >little variation in the pixels; no grain means good compression and
> >coarse grain means poor compression.
Quite right. I have a picture of a shaggy Siberian tiger that is a total
nightmare--there is grain, grain aliasing, and a *wealth* of original
texture that leaves almost no two pixels the same. It may be worth
mentioning that a forced, or "lossy" compression will also beat the hell out
of the picture detail. I could go back and reshoot him, but I think he died
a few years ago. :-)
Best regards--LRA
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