Re: No Color Adjustment
Re: No Color Adjustment
- Subject: Re: No Color Adjustment
- From: email@hidden (Bruce Fraser)
- Date: Fri, 26 Apr 2002 10:48:12 -0700
At 12:24 PM +0000 4/26/02, Steve Lawrence wrote:
As a driver developer the recent threads on selection of colour paths through
non-Postscript drivers for profiling has been interesting.
Obviously your requirements for such a path include:
1. The colour behaviour must be repeatable.
2. Colour gamut should be maximised.
What else would you add? I can see that a linear response and an
appropriate ink
limit when printing the testchart would be candidates if your characterisation
tool does not have pre-profile linearisation and testchart ink limit controls.
Would you prefer the driver perform those functions even if they are in the
characterisation tool? If so, why?
Even if the characterization software has linearization and
ink-limiting (a BIG if), it still takes a round of measurements, with
the concomitant expense of ink, paper, and my time...
It would be delightful if the driver did linearization, ink limiting,
and *gray-balancing* for your paper stocks. (We'll get to the tools
for handling third-party papers later!)
The driver obviously has to do the RGB to CMYK conversion for you due to that
pesky operating system limitation. Would you prefer it do a simple conversion
which makes no assumption about the nature of the ink and substrate,
such as the
"classic" one-minus RGB to CMY conversion with K=min(C,M,Y), or
would you prefer
a "fixed" accurate colour conversion, from say Adobe 98 to a canned output
profile?
I'd prefer it to do neither of the above, but rather a smart
RGB-to-CMY conversion that honored the RGB source profile.
In the case where there's no profile, I'd very much like to see a
conversion that assumed whatever RGB primaries and gamma result in a
linearized print with maximum gamut. Then I'd like to see that
assumed RGB space characterized in a profile, and published...
It would be really, really nice if the driver offered some explicit
control over ink limits besides the implicit control offered by media
types. I'd settle for something very simple, like a slider going from
less to more, that was wired into the media type settings so that
people could tell at a glance which ones laid down more and less ink,
and were able to tweak too.
Black shape control is probably too much to ask -- it could turn into
a hurt-me button -- but I'm sure there are those who would want it.
Bruce
--
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