RE: dot gain in appliocations
RE: dot gain in appliocations
- Subject: RE: dot gain in appliocations
- From: "Mike Eddington" <email@hidden>
- Date: Wed, 21 May 2008 15:20:45 -0400
- Thread-topic: dot gain in appliocations
>>(I know that dot gain is
>>converted into status T-density in Measure Tool and is in XYZ
>>in ColorThink)
Actually, MeasureTool is reporting TVI based on the DIN filter standard
rather than Status T. This could make a difference in the yellow TVI.
>> so my questions are:
>> Are the graphic representations the same between ColorThink
>>and Measure Tool?
Often no, per the calculation methods you mentioned.
>>Is there another software package on the market that is able
>>to read test charts and graphically evaluate dot gain for
>>cmyk profile?
I'm sure there are, but from an ICC profile, you could use the free
Dotgain Calculator from www.brucelindbloom.com. This uses XYZ data to
calculate TVI (as does ColorThink). If you're using MeasureTool
(licensed) you can measure spectral data, then calculate dotgain
yourself with an Excel worksheet, applying the Murray-Davies equation to
the CMYK scales. That way, you could calcuate TVI based on XYZ or status
T density (exported from Measuretool). Sometimes there a close
correlation between the two calculation methods, sometimes there isn't.
You could also create a text file of CMYK scales, drop it into a
ColorThink Worksheet, apply the profile (absolute rendering) and export
a text file of XYZ data from which to calculate TVI using either Bruce's
Dotgain Calculator or your own excel spreadsheet.
I'm really not sure overall how this assists with paper selection
though. If you've already undergone press calibrtation towards "fogra
characterizations" and press profile generation, hasn't that choice
already been made?
_______________________________________
Michael Eddington | North American Color, Inc.
QA Manager | Gracol G7 Certified Expert
5960 S. Sprinkle Road | Portage, MI 49002
P. (269) 323-0552 | F. (269) 323-0190
email@hidden | www.nac-mi.com | www.nac1to1.com |
www.photo360.com
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