Re: Spot Color tables in Best ColorProof
Re: Spot Color tables in Best ColorProof
- Subject: Re: Spot Color tables in Best ColorProof
- From: Marco Ugolini <email@hidden>
- Date: Sun, 01 Jun 2003 20:37:17 -0700
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Marco Ugolini wrote:
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Forgive me, but I am having trouble interpreting what you mean. Are you
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saying that the only PANTONE colors you can print via the Spot Color
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function within a color-managed queue in the Best ColorProof RIP are the
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ones that fall within the measured and profiled CMYK space?
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Roger Breton replied:
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You can print *ALL* the PANTONE colors you want via the Spot Color
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function within a color-managed queue in the Best ColorProof RIP. Some of
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those colors will be closer than others to the original.
So far so good.
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Marco Ugolini wrote:
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That would mean that, although the device is physically capable of printing
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a whole range of colors which fall OUTSIDE the profiled space for CMYK
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proofing, it cannot be done because the queue will not generate colors that
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are outside of it.
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Roger Breton replied:
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No, the device *has* its limitation and it can't physically print the range
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of colors which fall OUTSIDE its profiled space. It's not a matter of the
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queue.
I have trouble accepting that. A profiled CMYK device space is NOT
descriptive of the WHOLE of the device's printable color space. A profiled
CMYK space does NOT contain all of the device's printable colors! There are
colors outside that profiled space that are still printable on the device
(certain blues, greens, purples, bright reds, etc.), but are ignored by the
CMYK profile because they never occur in a typical CMYK scenario on press.
Or are you saying that the CMYK profile contains ALL of the printable colors
achievable on the device?
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Marco Ugolini wrote:
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To me, that seems debatable, at my current level of knowledge of the Best
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RIP. My impression is that the Spot Color function accesses the whole color
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space of the device, inside and outside that described in the CMYK profile.
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Roger Breton replied:
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The Spot color function cannot access more than the colors that are INSIDE
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the color space of the device.
Forgive me, but...duh! Who is saying otherwise? But -- what "color space"
are we talking about here? Do you mean to say that the profiled CMYK space
IS the complete color space of the device, "ne plus ultra"? There may be
disagreement on that.
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Marco Ugolini wrote:
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Do you know for a fact that it is not so?
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Roger Breton replied:
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How are you using the "Spot color function"? Give an example with perhaps
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some screen captures.
I do not have access to the device at the present time, so I cannot give you
screen shots. But I use the Best ColorEditor utility. I create a new custom
table, from scratch, go to the LAB tab, enter the name of the PANTONE color
that I wish to emulate, then the LAB values for it that I find in the Custom
Colors palette in Photoshop 7. Maybe those are not the most accurate values
to start from, but I have compared them to actual Spectrolino readings from
printed PANTONE chips and fans, and they are close. Of course, we all know
how PANTONE printed guides themselves can greatly vary from batch to batch,
and from chips to fans even in the same year's edition. So, who is to say
what is the closest match if even PANTONE cannot cut it? I work with what I
have.
Once I have entered the color names and corresponding LAB values, I save the
custom table, then load it in the Spot Color function in the Best ColorProof
RIP. So, nothing fancy, as you can see.
Thank you for your help.
--------------
Marco Ugolini
P.O. Box 1838
Mill Valley, CA 94942
home (415) 383-4527
cell (415) 902-8344
email@hidden
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