[argyllcms] Re: Use of calibrated display to profile digital camera
- From: Ben Goren <ben@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 27 Jul 2008 14:56:06 -0700
On 2008 Jul 27, at 2:35 PM, Gerhard Fuernkranz wrote:
> Ben Goren wrote:
>
>> [...] Except the neutrals, of course.
>
> ... and the neutrals on the CC have rather flat reflectance
> spectra, unlike on a IT8 target, where dark neutrals rather have
> three bumps (which is no surprise, since they are mixed from CMY
> colorants).
That's why I'm thinking of artist's pigment (pastels, acrylic,
I-don't-know). I know very little about it...but I'm hoping that
(e.g.) there's some sort of a carbon-based black that mixes well
with a titanium-based white...if those pigments actually mix the
way that I'm guessing I think they maybe might perhaps.
>> Graeme Gill wrote:
>>
>>> The more your capture device resembles the human eye in terms
>>> of its spectral response (the Luther condition), the fewer
>>> problems there will be with this aspect anyway.
>>
>> That's even better to know.
>
> Unfortunately, knowing it still does not make it happen :-)
True...and I still have this day job that eats up waaaaay too much
of my time.
But, I'm starting to think that this may well be feasible. And,
the great thing is that I don't think I'll need to precisely
target the color values with the artist's pigments. With luck,
the recipe should come down to something like, ``mix 3 parts
such-and-such with 4 parts this-and-that and apply at intersection
J13 on the chart.'' Measuring the chart should more than amply
make up for variations from chart to chart.
Hmmm...and a cutout overlay such as the ColorChecker uses would
eliminate the need for precise brush strokes, and would be easy
but tedious to make with a ruler and an Xacto...this just might
work....
The end result, if I'm lucky, should be a wide-gamut chart with
lots of patches, a good number of which have similar spectral
characteristics as a CC.
Cheers,
b&
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