Re: about negs and ROMM / Pro Photo RGB
Re: about negs and ROMM / Pro Photo RGB
- Subject: Re: about negs and ROMM / Pro Photo RGB
- From: email@hidden (Bruce Fraser)
- Date: Fri, 3 Aug 2001 17:30:31 -0700
At 4:00 PM +0000 8/3/01, neilB wrote:
Thanks for the tips Bruce
<snip
I can see a potential disadvantage for me here - because I often
rely on layers, so I need to go to 8 bit [and a less scary space]
before finishing. Is it right that Pro is just too risky [large] for 8
bit working?
Unless you're planning on making fairly large moves in 8-bit space,
ProPhoto is probably OK. I make all my big moves in 16-bit, but I
often downsample to 8-bit to do things I can only do with layers, and
so far ProPhoto hasn't been a problem.
> Conversions between working spaces, and conversions into working
spaces from capture spaces, are ALWAYS relative colorimetric. The
tables may say they're preceptual, but I bet you dollars to doughnuts
you'll get identical results using RelCol and Perceptual...
And there's my problem, no RelCol intents for >to> workingspace
conversions. In this case wouldn't the combination of staying
away from the boundaries of PRO and the sole intent available -
perceptual - perhaps serve to limit saturation if I did convert
to, say A-RGB [often needlessly??].
No, you missed my point. Conversions to a working space are always
RelCol or AbsCol. The rendering intent is always dictated by the
target profile -- the conversion from source to PCS is always RelCol
-- and while working space profiles may say that they have a
Perceptual intent, they don't. If you choose Perceptual (or
Saturation for that matter) you'll get exactly the same result as you
do when you choose RelCol -- try it and see.
No workaround springs to mind? How about you Bruce - any ideas
please, for a workflow involving Pro and later 8 bit - or do you
work Pro 8 bit /layers ?
See my first response.
Since my drum scanner actually produces neg.. scans which look
pretty good when I assign Ektachrome Space - Should I perhaps
stick to Ektachrome Space throughout and carefully do my major
colour moves in 16 bit before going to 8 bit for the layers?
I've generally found that EktaSpace works better for chromes than
negs. The key trick in my neg workflow is that I start out with a
deliberately flat, unsaturated scan. The way ProPhoto is built, the
saturation just falls into place as I add contrast, and that doesn't
happen quite as well in EktaSpace.
Best bet is to take a representative scan and try it both ways.
Bruce
--
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