Hello,
asking for the gamut of an input device is the same as asking for the
gamut of a colour measurement instrument.
Think of your scanner or camera as a colour measurement device. It's
most probably a very inaccurate instrument but you will always get a
value for any input colour.
Hence, it does not have a limit that should be called a "colour gamut".
Compared to that, an output device, is not able to reproduce every input
colour.
It's basically a question of how a "gamut" is defined.
The CIE definition is:
"a range of colours achievable on a given colour reproduction medium (or
present in an image on that medium) under a given set of viewing
conditions − it is a volume in colour space."
Best regards
Claas
Hermann-Josef Röser schrieb am 25.02.21 um 11:44:
Hello,
thank you for your explanation.
Yes, but an input profile maps from the color of the light hitting thesensor to its RGB values.
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.
So you could in principle throw every possible spectrum at the inputdevice, and (if it properly adjusted)
you should never hit an RGB limit.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.
Nothing very useful.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?
Best wishes
Hermann-Josef
