Re: Following standards (rendering intents)
Re: Following standards (rendering intents)
- Subject: Re: Following standards (rendering intents)
- From: email@hidden (Bruce Fraser)
- Date: Mon, 10 Dec 2001 12:54:41 -0700
At 2:06 PM +0100 12/10/01, Henrik Holmegaard wrote:
But is it doable at this stage to tell newbies that they should use
RelCol BPC for SourceRGB to OutputCMYK in a manual conversion,
revisit the Color Settings dialog to uncheck BPC, and then select
RelCol in the Print dialog (a three step workflow)? Personally, I
don't think so because pulling a proof print becomes so very complex
compared to recommending BPC off and Perceptual for Output followed
by RelCol for the proof print and soft proof, but I may be wrong (as
in so many other things, I'm sure).
You're overcomplicating matters.
You always want to use BPC when converting from source to output to
make sure that you use the full dynamic range of the output device.
For soft-proofing, the rendering from simulation space to monitor is
controlled by the ink black and paper white checkboxes. The rednering
intent and BPC settings apply only to the conversion from source to
simulation space.
With Ink Black and Paper White unchecked, the rendering from
simulation to monitor space is relcol+BPC. This is often useful,
though optimistic.
Checking Ink Black turns off BPC in the simulation-to-monitor
transform, and typically shows you somewhat weaker blacks (assuming
the profile for what you're simulating has a real black point rather
than a black hole.
Checking Paper White makes the simulation-to-monitor rendering
Absolute. It checks and dims Ink Black, because you can't use BPC
with Abscol.
Pulling proof prints is also quite easy.
If you want to proof CMYK from the RGB file, choose Proof Setup as
the source. If you're already in CMYK, choose Document Space as the
source. In either case, choose the proofer profile as the output
space, and set the rendering to Absolute Colorimetric.
The only case in which you'd need to turn off BPC in color settings
is if you wanted to use Proof Setup to simulate a
source-to-destination conversion using relcol with no BPC, or if you
want to print a "proof" using relcol with no BPC. (I can't think of
any reason why you'd want to, but if you do, you have to turn it off
in color settings.) In all other cases, the BPC control is exposed in
the UI.
Bruce
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