[argyllcms] Re: ArgyllCMS V1.1.0 RC1 is now available
- From: "Alastair M. Robinson" <profiling@xxxxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 09 Nov 2009 20:51:09 +0000
Hi :)
Graeme Gill wrote:
I guess I don't understand how that could happen unless the
ink is running off the page and obliterating the spacers. Have you
got an example (ie. a ti1 + command line that creates the chart +
specifically which spacers aren't distinguishable ?).
Yup - TI1 attached, printtarg command line is a very basic
printtarg -T -R 66 -i41 -pA4
and a scan of the first eight columns:
http://blackfiveimaging.co.uk/temp/TC1_sRGB.jpg
Note that for B1 I tippexed out the spacers, then drew them back in with
red marker pen!
That was enough to make strip B readable, but then the instrument choked
on strip C so I gave up!
My expectation for the printer calibration is that the usable range is
> being set and handled by the printing system since it is closely tied
> to the printing mode.
Whereas what I'm trying to do is, at least, partially to tune the
printing system at pretty much the lowest level possible.
So for instance, if 100% into the screening at maximum dot size puts
down 400% ink coverage, then the usable range will be somewhere around
0.25
But how do you define "usable range"? On this particular 100gsm matte
paper, I define "usable range" as "the range within which a single
channel at full scale doesn't seep through to the other side of the
paper". On glossy paper I consider it to be the range within which no
ink puddling occurs.
> While the usable range adjustment could be incorporated into
the calibration system, it doesn't seem to sit very comfortably there to me
in the situation where calibration is a very common occurrence (used
much more often that profiling for instance).
Yes, fair point - and in GPLin the first step I perform is to print a
sweep which is used to select a "base density" - some suitably high
density at which neither print-through or puddling is apparent - this I
think corresponds closely to your concept of usable range.
This much is not non-linear, so has no negative impact later in the chain.
As I've said, though, using this base density limiting alone results in
very dark charts which are hard for the instrument to read.
Right, but why is this a problem ? Non-monotonicity in the a*b* plane
doesn't imply non-monotonicity in L*a*b*, and the linearization will
take care of making the locus uniform, while profiling
takes care of what each colorant and the combinations of colorant
are doing.
True enough. I guess my difficulty is in finding an objective criteria
for where to limit individual channels. If you let them go just shy of
saturation (as per what I think you meant by "usable range") then
there's no "headroom" for combination colours, and the TAC for profiling
would then need to be 100%. If the usable range should be narrower than
that, then how best to choose the limit? And the hue drift as ink
coverage increases is the criteria I currently use in GPLin for this.
The measure of DE from white vs. colorant level shows when you
get to diminishing returns.
And that's the crux of my problem I think - without some kind of gamma
adjustment in the chain I can't read the chart. With that adjustment in
the chain, there's non-linearity in the path which is hidden from Argyll
(which can't be helping the diminishing returns calculation!)
Hence my request for the ability to specify a gamma value at the targen
stage!
All the best,
--
Alastair M. Robinson
CTI1
DESCRIPTOR "Argyll Calibration Target chart information 1"
ORIGINATOR "Argyll targen"
CREATED "Sat Nov 7 18:16:43 2009"
KEYWORD "APPROX_WHITE_POINT"
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KEYWORD "COLOR_REP"
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KEYWORD "TOTAL_INK_LIMIT"
TOTAL_INK_LIMIT "100.0"
KEYWORD "WHITE_COLOR_PATCHES"
WHITE_COLOR_PATCHES "4"
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3 50.000 50.000 0.0000 0.0000 15.975 13.130 22.609
4 0.0000 0.0000 100.00 0.0000 76.000 81.000 11.000
5 50.000 0.0000 50.000 0.0000 25.340 30.518 17.871
6 0.0000 50.000 50.000 0.0000 42.312 31.184 10.818
7 25.000 25.000 25.000 25.000 19.637 18.626 13.622
8 33.333 33.333 33.333 0.0000 26.194 23.916 16.783
END_DATA
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