[argyllcms] Re: About Hi-Res spectral mode
- From: Gerhard Fürnkranz <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 03 Oct 2011 13:01:30 +0200
Well, the sensor's sensitivity is typically bell-shaped, so the S/N ratio is
certainly better at green wavelengths, while it can be significantly worse at
the blue and red end.
"János, Tóth F." <janos666@xxxxxxxxxx> schrieb:
>I noticed it when I made my previous charts that the wavelength interval is
>extended in HiRes mode and the curves seem "noisy" in that extra range.
>
>I made new charts with the same set of measurements, this time from 11% and
>22% white patches.
>Both measurements were taken with HiRes mode, the first one with normal and
>the other one with Adaptive mode.
>
>http://img692.imageshack.us/img692/1084/43070804.png
>
>As you can see, there is a noisy range between 360 and 400nm (and may be
>between 730 and 740nm too).
>I don't think it can make a significant difference when measuring light
>color shades but may be it can significantly degrade the accuracy of the
>low-light measurements in both normal HiRes and Adaptive HiRes modes.
>
>I am not sure if it's a problem with my CM or a nasty thing of the plasma
>display panel, but it looks like random noise for me. And given that it's in
>a range which is normally clipped in Default mode, I guess it could be a
>bug.
--
Best Regards
Gerhard
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