[argyllcms] Re: printcal difficulty
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 10 Jun 2011 00:22:24 +1000
Kirk Economos wrote:
Both the cmyk and lab values in my ti3 represent measured values. There is
How do you measure the CMYK percentage on the page ?
(There are instruments that measure dot coverage, but they are rather
specialised.) I guess they could be doing some sort of profile
lookup on the CIE values, but what the point of it would be I don't know.
no reference/patch definition data. I am new to printcal, my first use was
to import a file measured in a third party ap. I didn't have a clue on what
the file needed to include or what format it needed to be in.
Like all color characterization charts, you are trying to connect the
device values that are fed into the printer (CMYK values), with
the resulting measured color values (XYZ or L*a*b*). 99.9% of the time,
the CMYK values in test chart data are the device values used to create
each patch. Chart measurement data where this is not the case is
a bit unusual.
I wrongly assumed it could work from the data provided. I can go back, pull
the cmyk values from the reference patches and fix the ti3 (cmyk patch data/
measured LAB). Do you think that would work?
Yes it should help. That's all the .ti3 needs, the device values used to
create the patches and the measured color values.
Graeme Gill.
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