xplore in my color
engine, and I've been content to stick to portable C code,
while wringing what I can out of it.
Exploiting GPU texture lookup hardware seems far simpler to
code for, for maximum overall speed. ]
Ch
ell as their relationships between each other.
Clipping -ve per component values is easy to implement, but
just like the whiter than the white point case, you can
end up with hue shifts and other undesirable changes to
the intended color.
Graeme G
maths when specifying
media included or media excluded densities or XYZ values. ]
Graeme Gill.
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, no-one normally looks at the illuminant - it
will be bright and glary. Normally you can only see it indirectly,
such as from the thing that is primarily occupying your field
of view - i.e. the paper stock.
Graeme Gill
the whites of images printed on it, look white. Yet ICC applies
Wrong Von Kries in accounting for the difference between the D50
illuminant and the media color.
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not so, is easy to refute - you just have to examine what's happening
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You can find it here http://www.argyllcms.com/cmyk.icm
I'll include it with future ArgyllCMS releases.
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chromatic adaption
transform rather than Wrong Von Kries.
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couldn't use them, what would be
the point of buying it ?
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information exported though - their older
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calculations, and it would seem foolish
to do so because the ICC standard doesn't prescribe such an implementation
as far as I'm aware.
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neutral will look yellow brown when displayed
with absolute colorimetry on a D65 display.
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all kind on moot
for color managed applications though.
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probably want to check out the ICC SampleICC project if you want
alternate (free) profiler functionality. I don't actually know
if it provides the functionality you are after though..
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Richard Hughes wrote:
I thought chad had to be invertable?
You can invert it in lcms, but typical CMM's
won't even try. So what's the point in figuring
out the devices real white point if you can
never access anything to do with it when you
use the profile ?
Graeme Gill
Marti Maria wrote:
Hi,
transferFunction = cmsBuildParametricToneCurve(0, 4, Parameters);
Aren't parametric tone curves an ICC V4 feature ?
cmsSetProfileVersion(hICC, 2.1);
Or does this convert it to an ICC V2 compatible table ?
Graeme.
Pascal de Bruijn wrote:
I'm not particularly clear on what ScriptCode is, glancing over the
ICCv2 spec didn't clear anything up either...
It's an old Mac internationalization thing. If you go rummaging around
in Mac history, there is some info on it.
Graeme Gill
profile doesn't do it that way,
and doing it that way wrecks absolute colorimetric and proofing uses.
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for this is a poor one though (so called
Wrong Von Kries).
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Mark wrote:
For wide gamut I am seeing a* values as high as -211 and b* of +166.
Yes. a*b* values are essentially unbounded. For practicality, the ICC define
a range of values from -128 to +128, but there are real world situations
where this range is not big enough.
Graeme Gill
steps.).
(I'll leave Marti to answer the lcms questions :-)
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fraction of
the volume of the cube you are populating.
So overall you are better off trying to stick to device to device
lookups as much as you can.
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to device setup
rather than characterization. Apple would need to offer it
to the ICC, and the ICC would have to be interested in taking
it over for it to ever become an official ICC tag.
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of colour management that they depend
on.
Oh good, they can re-implement ICC file parsing and profile interpretation
all over again, and make all the same mistakes as everyone else did.
(In fact probably even more, if they aren't very familiar with color science).
Graeme Gill
safe, and the former have the advantage
of better availability.
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it's just the B2A
not matching the A2B with regard to the white point. This could
be due to poor accuracy of the B2A, or a poor choice of grid
locations (you have to arrange the per channel tables such that
the PCS white lands on an a b grid line to get an accurate
white out of the B2A).
Graeme Gill
, and CPSI has a poorer set of extensions
called Proofer Plug-In and DeviceN Process Color Model that can
also be turned to the same purpose with some effort (been there,
done that.) I'm not sure if Ghostscript has a similar mechanism or not.
Graeme Gill
is used by many of the 3D animation studios
to do color managed previews of animation's. The example OpenEXR
viewer is such an instance, and the source code is available.
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and this conclusion:
http://lists.freedesktop.org/archives/openicc/2006q3/000775.html
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is adapted to the display, but
not completely. This is equivalent to linking
the output medium profile using absolute to the display
profile using relative colorimetric.
(ICC V4 display profiles have made this the default
behaviour for so called V4 absolute intent).
Graeme Gill
.)
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split the profile into three viz device, CAM, and gamut.
Why could nt it keep it in a single profile as ICC profile did.?
Flexibility. You can mix and match each of these, reducing the
combinatorial explosion that would result if you tried to package them
all together.
Graeme Gill
?
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(assuming you
needed to return to the original space). It is possible
to do this type of thing in OpenGL using texture mapping
lookups to do the color conversion interpolation, but
this obviously involves a number of steps.
Graeme Gill
, but easy in the end).
Of course some of this may be card/driver/configuration
dependent.
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What I am trying to work out is, will all people with this version of
Norton get this message if they attempt to download a file with an
ICC profile in? I know Norton are the people to ask but I'd get blood
out of a stone quicker.
Probably.
Graeme Gill
that Wolf is willing to produce for this effort?
I don't have a specialized slide scanner, but I do have an Epson 4990,
if that is of any interest.
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= 1.210566
With calibration:
Errors: max. = 3.447379, avg. = 0.938222, RMS = 1.089465
Errors (CIE94): max. = 2.689617, avg. = 0.461286, RMS = 0.540222
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an instrument,
and the resulting XYZ values will form the reference file.
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is not going to help a lot I would
imagine, since the reflective target is broad band, and most displays are
narrow band sources (spectrally, the chart and the display are a very
long way apart).
Graeme Gill.
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implemented a
straight through black hack in the DiceNet/Colorbus device link
linker even earlier, but this was only used for business documents
to preserve black only text. You got some funny effects on images in
CMYK documents at times !)
Graeme Gill
, such
as the monitor controls etc., and is the wrong information
to store in a profile
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useful for proofing,
not much use for anything else.
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, but they don't seem to be publicly accessible anymore.
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behaviour backwards compatible with
V2 (so that users and applications don't see any change between V2 and V4),
and add a new ICCV4absoluteColorimetric intent for those who prefer
the V4 behaviour.
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to check for an exact match
(as supposedly ICCabsolute is intended), then they won't
match - the display output will be too blue.
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:- incompatible with everything
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values for a display profile.
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Jeffrey M. DiCarlo, Glen Eric Montgomery and Steven W. Trovinger
was also avery interesting, different approach.
Some comments at the conference were that the IEC chart seemed
to be difficult to get hold of (your link provided a contact though.)
Graeme Gill
different base colorants.
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scanner test charts with a range
of GCRs, and then use the appropriate scanner profile for measuring
printer test patches with the matching GCR to hope to compensate for
this effect.
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and compressing 256-1023 into 0.5 - 1.0, if that suited your purpose.
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approaches.
A lower dynamic range, higher resolution (and perhaps lower noise) version
of such a sensor would give film a run for its money.
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to map
an out of gamut value back to the device range. The usual choices
are available (keep constant hue ? de-saturate ? etc.) All depends on
how much trouble you want to go to.
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