Re: ps6: new user
Re: ps6: new user
- Subject: Re: ps6: new user
- From: Bob Cornelis <email@hidden>
- Date: Mon, 19 Feb 2001 08:03:32 -0800
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In a message dated 2/17/01 2:38:54 AM, email@hidden writes:
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>i just upgraded to ps6 after hearing all about it's proofing
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>capabilities. i would like to know:
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>
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>1) what setting do i use in proof color setup? i mean i have the cmyk
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>profile for our printer but my RGB pictures look really horrible "very
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>low contrast and dull grayish blacks(99% ones)" with "paper white and
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>"black ink" "ON". it matches the print exactly with these options off.
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>does this mean my monitor calibration is not correct.
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The paper white and ink black settings are most practical for off-white
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papers and dull inks, for bright paper and dark ink, they are
unnecessary,
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and unless tuned, are not appropriate.
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>
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>2) why should i use "relative colorimetric" or "absolute colorimetric".
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>"relative colorimetric" gives good results but "absolute" looks like
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>someone has changed the monitor setting from 6500k to 9300k. the
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>neutrals just go bluish. is it only for CMYK to CMYK?
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Perceptual is most typical, absolute colorimetric would only be for
proofing
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off-white paper on brigher proofing stock, and does not work in
conjunction
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with the paper white and ink black settings, as this applies the same
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corrections a second time to the return tables used for monitor viewing.
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>
C. David Tobie
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Design Cooperative
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email@hidden
This is interesting and the first I've heard confirmation of some observations
I've made about softproofing in PS6. Generally I've found the
softproofing
results unsatisfactory when using either white or black ink settings for
brighter prints such as Lightjet 5000 or Fujix. The white ink setting causes
the whites to look too dark (I've heard this is because this was implemented
with absolute colorimetric intent) while the black ink setting really washes
out the shadows. It is a very different rendering from using separation tables
in PS5 (expected) or using the preview button in Convert to Profile
(unexpected -
shouldn't this be the same as using the softproof option?).
I did a test where I printed a 21 step grayscale and took a screen shot
of it
with and without the softproof on. I then measured the values of each step
in PS with the eyedropper. The darkest value read about 10 without the softproof
on and ~35 with it on. This gap slowly closed as you moved up the steps until
they were about equivalent in the midtones (black ink was on, white
off). So
I'm measuring pretty much what I'm seeing but it sure doesn't match a Lightjet
or Fujix print (BTW I'm calibrating my monitors with ProveIt! and the matching
with these prints is excellent - when I don't use the softproof!).
Also interesting is that I find that the match is much closer when I am softproofing
for inkjet prints on a Roland on watercolor papers - there I use the
black ink
and the washing out effect is a better representation of the lower dmax
of the
paper compared to Lightjet or Fujix output.
Are you suggesting that for output such as Lightjet/Fujix white and
black ink
off is best? Why would the softproof view be different than the Convert
to Profile
view?
Bob
--
Bob Cornelis
Email: email@hidden
Website:
http://www.colorfolio.com