[argyllcms] Re: Viewing chart readouts
- From: "Alastair M. Robinson" <profiling@xxxxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 31 Dec 2010 11:25:49 +0000
Hi,
On 30/12/10 22:46, Elena [service address] wrote:
So I ask: is there a way, without using hacks, to convert a .ti3 reading file
into a
picture, to visually check what you just read ?
Such conversion from xyz/spectral/whatsoever to RGB should, of course, be made
using
a proper illuminant and the monitor profile.
Not yet, sadly. The way I approach this is twofold. Firstly I use the
-v switch in colprof so at the end of the profiling process I get a
fitting error readout. For a decent inkjet on good paper, if the
maximum error is much above 3 or 4 dE then I get suspicious of misreads.
Secondly, I perform an absolute colorimetric conversion of the original
TIFF testchart, from the newly-created printer profile to the monitor's
profile - i.e. soft-proof it - then display that fullscreen on a black
background (without colour management since it's already targetted to
the monitor) and visually compare the printed testchart with the proofed
version.
An even better idea would be for chartread to open a gfx window to display
every time the currently read patch or strip.
Yes, that would be good.
And checking the numbers inside the .ti3 file by eye to detect serious
misreadings
is an impossible task (for a human, at least)
Indeed, though the fitting error report from colprof -v, (or profcheck
if you want to check after the profile's complete) is a useful indicator
of whether the readings are generally good, even if tracking down the
actual bad patches is tedious! (Graeme's said the next release of
profcheck will be able to print out patch names, so tracking down bad
patches should get easier before too much longer.)
All the best
--
Alastair M. Robinson
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