[argyllcms] Re: spotread filters
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 06 Jun 2008 11:34:30 +1000
Jacques Warnon wrote:
Thanks Graeme, I guess that's a little out of my league for the time being.
I got really excited when I first read about Argyll's custom FWA
compensation when used with profile. But since I'm profiling a CMYKRB
printer, I realize now I can't profile with Argyll. So when I saw the
option to put in a custom filter at the measurement level, I just wanted to
find out what that was about. Seems like I will still be editing
measurement files in excel for the time being.
You can apply Argyll's FWA compensation without using Argyll's profile
making. Simple use spec2cie on the spectral .ti3 files, then convert
the resulting CIE tri-stimulus values into whatever format you like.
It won't help if it's not a Fluorescent whitener effect though.
I have asked this question to Gretag/Xrite before with no real luck, but I
will post and see if anyone has an idea. Our printing media (sublimated
polyester) seems to wreak havoc on colorimeters, especially in the
highlights. It seems similar to the effect of optical brightening agents,
but much more pronounced. Profilemakers optical brightening option doesn't
fix it, and a borrowed UV cut i1 didn't help either. If I were to put it in
simple terms, I feel like I need to calibrate my i1 spectrometer to my
media. But how does one go about calibrating a calibration device? It
seems to work well on coated papers, but fabrics are a different story.
You need to figure out what the effect is. If it's fabric you are dealing
with, then it could be gloss that's an issue. Have you tried using a polarizing
filter for instance ? (the Spectrolino has one).
I understand that those working seriously with fabric and color will have
instruments other than a graphic arts 0/45 degree instrument available to them,
such as integrating sphere instruments. Maybe something like that is
more appropriate for the kind of work you are doing ?
Graeme Gill.
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