[argyllcms] Re: Printer Profiling Patch Count and Profiling Generation Quality
- From: "Alastair M. Robinson" <profiling@xxxxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 05 Jan 2010 00:59:59 +0000
Hi :)
Pascal de Bruijn wrote:
I'm having my first forays into printer profiling now. With
encouraging first results.
Oh good luck! Lots of fun (and frustration) to be had with printer
profiling!
The first profile I did was with 90 patches and -ql which seemed to
work reasonably well for satin photo inkjet papers, and less well for
true-matt photo inkjet papers.
Yup, it's surprising just how well a very sparse profiling target can do
if you have a "well behaved" combination of printer, ink, paper and
printer driver.
Now I read my first 210 patch target (which worked excellently), and
I'm wondering whether it has any merit to use -q m?
Yes, I would say so.
And what if I do a 420 patch target, or 630 or 840? At what patch
counts are certain profile quality levels sensible?
-qu is almost never sensible! I tend to do everything at -qh simply
because I've usually augmented the profiling target with extra patches
around the grey axis, or a few more finely-spaced points around
particular trouble spots. My profiles therefore benefit from the higher
CLUT resolution in certain parts of the gamut, and where it's not needed
it doesn't help.
You might find that technique worth exploring yourself, by the way,
since you have a fairly limited number of patches available. Having
created a .ti1 file it's fairly simple to open it in a spreadsheet and
add patches or adjust the existing ones. I suspect you might find the
210 patch targets give great results in general but don't have enough
near-grey patches.
All the best
--
Alastair M. Robinson
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