[argyllcms] Re: AW: Re: AW: Re: Question about viewgam
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 25 Feb 2021 22:55:34 +1100
Hermann-Josef Röser wrote:
Hi,
Yes, but for my scanner the input spectrum is constant (LED) and the
ICC-profile also should convert this non-standard illumination to e.g. the
standard D50.
The illumination in a scanner is just a way generating a color spectrum
from a color filter, otherwise known as a print.
The spectrum hitting the sensor is the white scanner light filtered
by the colorants in the paper of the print.
If the incident light is too bright, I do hit the limit 1, i.e. saturation
for a given setup (e.g. exposure time). This is something I try to avoid
with the scanner.
Sure - which is why I said "if it properly adjusted". Such an occurrence
is not a color gamut limit, it is an exposure limit.
I use viewgam to compare the "gamut" of the scanner e.g. with AdobeRGB. So
this is meaningless, you say? I had thought this way to see the out of
Adobe-gamut colours of my scanner?
I don't know what you mean by "Adobe-gamut colours of my scanner".
If you were to feed the AdobeRGB gamut surface colors (i.e. CIE XYZ values)
into the PCS->device table of the scanner (and assuming acceptable white
point adjustment) you will get the equivalent scanner device RGB values out.
That's the AdobeRGB gamut encoded in your scanner RGB space. It's not a
scanner gamut though.
Claas Bickeböller wrote:
asking for the gamut of an input device is the same as asking for the gamut
of a
colour measurement instrument.
Nice analogy Claas !
Cheers,
Graeme Gill.
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