[argyllcms] Re: "Wrong" ambient light reading with colormunki
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 11 May 2010 12:02:38 +1000
Roger Breton wrote:
Don't trust a reading of 0.09 cd/m2 with any instruments except from very
expensive colorimeters and spectroradiometers. Very few instruments have the
needed sensitivity to measure that few photons. You could aim for 0.5 to
1.0.
That depends on the instrument and how it is driven. The absolute accuracy may
be in some doubt, but something like the i1pro and ColorMunki give reasonably
consistent low light readings when used with longer integration times
(which is what you get using "adaptive" mode, the default emissive
measurement mode in spotread, and the option -V mode in dispcal/dispread).
Instruments running with fixed integration times (or that use the cheap light
to frequency sensors) will tend to get less consistent at such low light
levels.
Graeme Gill.
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