Re: CMS blues
Re: CMS blues
- Subject: Re: CMS blues
- From: Andrew Rodney <email@hidden>
- Date: Fri, 12 Jan 2001 17:50:43 -0700
on 1/12/01 11:29 AM, email@hidden at email@hidden
wrote:
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I think I would want to use Absolute Colorimetric
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for my inkjet proofing, and Perceptual for conversion of images destined for
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the press.
Yup although there are images that will benefit from a Relative
Colorimeteric intent. But in your workflow, who has the time to look at each
image and decide in the Convert to Profile dialog which is better. So stick
with Perceptual and you'll be in good shape for that output need. In about
30 days, ask me about a new product under development that will be a
wonderful new automation tool you'll want for doing this and much more with
images inside of Photoshop. It will even automatically select the rendering
intent for you after analyzing the image. I'm under NDA now so I can't
really say much until the end of the month.
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2) I used the Measure tool to calibrate one of my monitors and then
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ProfileMaker to create a profile for it.
You can do this directly in ProfileMaker if you want.
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after I have calibrated the
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monitor should I no longer use the Adobe Gamma created profile as the system
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profile, or the Knoll gamma control panel as a global adjustment?
Yes, toss gamma (in fact you should have tossed Adobe Gamma prior to doing
the calibration and profiling with ProfileMaker to be on the safe side). You
don't want double calibration going on.
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Problem is he used a white point of D65 and I don't
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know why. I am not comfortable with changing all the monitors without first
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hearing that what I believe I've learned is correct.
More and more people (myself included in the last few years) have moved from
a D50 white point to a D65 white point. The major issues is a dingy yellow
looking preview with D50. What I'd say is that you can try working with D50
since you did all your work and see how the print to screen matching looks
to you. If you find that the images exhibit this yellowish appearance, go
for D65. If you are happy with the matching, stick with what you have. There
really is no right answer if the screen to print match. With my old
Pressview calibrated to D50, I was quite happy with a D50 white point. But
when I moved to a display like my Barco that allowed me a choice in
whitepoint, I found D65 worked better.
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3) I have a gamut for inkjet proofing and a different one for press. Will I
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need to convert my images twice then, once for the proofer and once for the
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press? If so, should I be doing the color space conversion in the print
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dialog from quark where I can use different rendering intents and profiles
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rather than in PhotoShop?
What you'll do is the initial conversion from RGB to CMYK to your final
destination and then a CMYK to CMYK for the ink jet. This is where that
Absolute Colorimetric intent is used. Quark scares me! When every possible I
do what I can in Photoshop. But I don't have a production environment to
worry about. I can see why you'd want to do this in Quark.
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4) I am hoping to find a definitive book on color management which is
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written fairly clearly.
One of the best ever came with the ColorTron way back when. I'm not sure if
it's available as a PDF or not any more. The X-Rite site may have it as well
as other good stuff. Real World Photoshop is another book you just have to
have. While it's not a CMS book per say, the chapter covering color and
Photoshop will be highlighted and dog eared if you use it like I do. The 6.0
version isn't out yet. Plus the rest of the info in the book on Photoshop is
wonderful. A lot of the "theory" in the older 5.0 book will still apply so
I'd get a copy now and hope the new version is out and get it when it is.
The book you got with ProfileMaker is good but a tad technical and yes,
there are some translation issues. It's still a good source of info. The
people that make ColorSynergy have a really good manual for their product
that does go into some theory and is very well written.
Andrew Rodney