Bret,
Many thanks for suggesting Don's presentation. It made perfect sense after
speaking with Dick Presley of Kodak Polychrome Graphics and reading Don
and Larry Warter's article "GRACoL Guidelines for Realistically Applying
Color Management" in the May/June 2005 IPA bulletin
(http://www.ipa.org/pdf/J-05-GRACol-Guideline.pdf). Don and Larry's
article puts in prose form the ideas outlined in the presentation on the
GRACoL website.
After reading Don and Larry's compelling argument that gray balance is
paramount, I'm no longer as concered with matching specific TVI numbers
over a range of tones.
In the case anyone is interested, Dick sent me the following TVI values
from certified IPA RoundUp press sheets that came from a test at Integrity
Graphics in Windsor, CT. According to Dick, this test run was one in which
gray balance was given greater weight when making press adjustments.
Yel Mag Cyn Blk
25% 17 15 10 19
50% 19 17 16 21
75% 11 10 10 14
email@hidden
> Check out Don Hutcheson's presentation "The Quest for Real Print
> Standards"
> at www.gracol.org DTR004 and the GRACoL spec are likely to change in the
> near future. Don's method has been used on several GRACoL pressruns, with
> promising results. L. P. Thebault will be doing the next GRACoL run next
> week. We have used this method, and we like what we have seen.
>
> Bret Hesler
> L. P. Thebault Company
>
>
>> Date: Thu, 14 Jul 2005 05:24:50 -0700 (PDT)
>> From: "RS" <email@hidden>
>> Subject: GRACoL Press Sheets & Dot Gain Curves
>> To: email@hidden
>> Message-ID: <email@hidden>
>> Content-Type: text/plain;charset=iso-8859-1
>>
>> GRACoL 6.0 provides a helpful chart of dot gain values CMYK inks at 50%
>> for various paper and line screen combinations. It lacks, however, dot
>> gain values at points other than 50%. I'm documenting the current dot
>> gain
>> curve of a press and am interested in doing a more thorough comparison
>> of
>> this data set, and I'm curious if anyone here has seen (or measured
>> themselves) dot gain values of a GRACoL DTR 004 sheet in steps of 5% or
>> 10%. (Although I've not seen one, I'm assuming the GRACoL sheet has step
>> wedges of each color).
>>
>> While the press with which I'm working may print within GRACoL's dot
>> gain
>> range at 50%, I'm interested in seeing how much its gain differs in the
>> quarter- or three quarter-tones. I just want to be certain there isn't
>> anything wonky going on with the press at points other than the
>> midtones.
>>
>> email@hidden
>>
>
>
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/colorsync-users/email@hidden
This email sent to email@hidden
