Re: Linearizing a press (was Re: Max K generation question)
Re: Linearizing a press (was Re: Max K generation question)
- Subject: Re: Linearizing a press (was Re: Max K generation question)
- From: "stevej" <email@hidden (nospam)>
- Date: Mon, 27 Sep 2004 17:42:11 -0400
This makes no sense to me, Roger...
Follow along...
You tell Photoshop there's a 25% dot gain, so when PS
outputs the file: a 50% dot is given a value of 40% so
that when it gets to paper it will indeed be a 50% dot.
So isn't dot gain just compensating for nonlinear output?
----- Original Message -----
From: "Terry Wyse" <email@hidden>
To: "'colorsync-users?lists.apple.com' List" <email@hidden>
Sent: Monday, September 27, 2004 03:45 PM
Subject: Linearizing a press (was Re: Max K generation question)
>
Hi Roger,
>
>
Depends on what you mean by "linearizing". If you mean make a 50% dot
>
on plate measure as a 50% dot on paper, then, no, you'd probably NOT
>
want to do this. A press (and the separations/CMYK recipes being fed to
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it) is expected to have a certain amount of dot gain/TVI (Tone Value
>
Increase). "Normal" TVI is anywhere from about 15% to 25% depending on
>
what you're targeting. I think if you attempt to linearize a press from
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a dot% standpoint, you're profiling package will probably have a hard
>
time dealing with it as the spacing of the values on a step wedge will
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be sort of whacked from a colorimetric standpoint. As an experiment,
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try linearizing and profiling an inkjet printer in the same manner and
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you'll see what I mean! You'll probably end up with very abrupt
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transitions in the shadows.
>
>
I prefer the term "press optimization" where you measure the press's
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current state using linear plates and then adjust the plate curves to
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achieve a specific TVI (GRACoL/SWOP/whatver). This is the standard
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process I go through in setting up a press prior to profiling it.
>
>
Now, if you're talking about linearizing a press using something other
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than dot gain/TVI as a measure, then I'm all ears! I've had some ideas
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in this area that I'd like to try but that I'm not ready to divulge
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publicly.
>
>
Cheers,
>
Terry
>
>
>
On Sep 27, 2004, at 8:45 AM, Roger Breton wrote:
>
>
>>> Has anyone ever attempted to "linearize" a printing press, prior to
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>>> profiling?
>
>>
>
>> How do you mean, Roger?
>
>>
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>> Rich Apollo
>
>
>
> I mean find screen percentages input values that will yield a linear,
>
> progressive (monotonic?), Tone Value Increase on the press. Sort of
>
> when you
>
> take a look at dot gain curves on a well linearized inkjet printer. I
>
> hear
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> some folks in Europe go through this exercice before they try to
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> profile a
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> press.
>
>
>
> How that is done, in actual practice must not be for the faint of
>
> heart as
>
> it requires some iterations. I hear it's easily done on a QuickMaster
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> DI.
>
_____________________________
>
WyseConsul
>
Color Management Consulting
>
email@hidden
>
704.843.0858
>
http://www.colormanagementgroup.com
>
http://www.wyseconsul.com (coming soon)
>
>
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