Joel
Yes, of course, the degree of compression varies between "quality"
levels; I was thinking of size alone.
JP2k is rather a sore point with me. I bought PS CS partly on the
promise of integrated support for JP2k, but it takes 3 months to save a
100mb file in this format. For some reason Adobe decided that the user
wants to control the format more closely than other formats and gives
the user a pre-save dialogue box with a preview of the effect. It's
like the Save for the Web operation: way too complicated ...
... so I don't use it now. I will save my files as .psd as that seems
to be smaller than a .tif file, save re-sized and re-sampled files for
web use (600 pixels, re-sampled using Bicubic Sharper) and use .jpg for
keeping a smaller file for cataloguing. The main file will go on a CD
or DVD and, of course, I retain the negative or slide in case my drives
go kaput.
Chris
On 30 Oct 2004, at 13:58, Joel Wilcox wrote:
> Chris,
> Yes indeed, SHQ is just unsquashed .jpg according to my docs. I don't
> really know the effect of compression other than producing a smaller
> file
> by throwing stuff away, which seems like a bad thing and waste of all
> the
> capture effort. A number of years ago I knew of a very fine
> photographer
> (who was unfortunately otherwise a pretty nasty person), who would
> archive
> all his keeper images as .jpgs at quality level 12. That results in a
> file
> about half the size of a .TIFF or .PSD but still very large for a
> .jpg. A
> large .jpg seems a bit like dehydrated water with some of the water
> stirred
> back in. I sometimes save SHQ captures after postprocessing as .PSDs
> just
> because I keep thinking saving to .jpg takes the blood out of them.
>
> Are you still working with jp2000? If so, how's it working out?
>
> Joel W.
<|_:-)_|>
C M I Barker
Cambridgeshire, Great Britain.
+44 (0)7092 251126
http://www.threeshoes.co.uk
http://homepage.mac.com/zuiko
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