[argyllcms] Re: help with camera profile
- From: edmund ronald <edmundronald@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 30 Jul 2012 00:04:56 +0200
The whole color management technology was designed around the idea that
computers were being used to transfer images on film to printing presses.
Now we are using electronic devices for both capture and display, and
surprise! the old tools are if not quite obsolete at least quite limited
and cumbersome . Get over it. Ask the ICC to either get into the business
of standardising colors for electronic capture and display, or tho retire
to the old people's home.
Edmund
On Sun, Jul 29, 2012 at 11:45 PM, Ben Goren <ben@xxxxxxxxxxxxxxxx> wrote:
> On 2012-07-29, at 12:55 PM, Iliah Borg wrote:
>
> >> If I try to do the same with the 7D profile, the error gets higher (27
> >> as peak) and even after removing 3 patches it stays to 17. The "bad"
> >> patches are always orange/yellow.
> >>
> > it might depend on the output colour space and how they get their. I
> mean, have you checked for clipping?
>
> Iliah's excellent point deserves a bit of expansion. For example, sRGB is
> only big enough to encode 96% of the ColorChecker gamut, and only 83% of
> the Digital ColorChecker gamut. Indeed, there isn't a single standard
> reference chart that sRGB can entirely encode without clipping:
>
> http://www.brucelindbloom.com/index.html?WorkingSpaceInfo.html
>
> If you follow the link on that page to his ColorChecker calculator, you'll
> see that the cyan patch needs a negative red value in sRGB. I don't think
> it's quite enough to account for a double-digit DE error, but I can't do
> that kind of math in my head...besides which, the classic ColorChecker
> orange / yellow patches are well within the sRGB gamut.
>
> If you don't want any clipping in any of the standard charts, there're
> only two working spaces to pick from: the oversized ProPhoto RGB, and
> Bruce's own Beta RGB. If you're using Adobe products, your only choice for
> color space after raw conversion to avoid clipping is ProPhoto, since it
> doesn't support Beta RGB. Canon's Digital Picture Professional doesn't even
> give you that choice. As they say, your mileage not only may vary, but it's
> pretty much guaranteed to....
>
> Cheers,
>
> b&
>
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