Re: Colorsync-users Digest, Vol 4, Issue 347
Re: Colorsync-users Digest, Vol 4, Issue 347
- Subject: Re: Colorsync-users Digest, Vol 4, Issue 347
- From: Graeme Gill <email@hidden>
- Date: Mon, 24 Sep 2007 14:49:45 +1000
Roger Breton wrote:
Anything to do with the fact that these two instruments are not capable of
the same spectral resolution? So, with the PR-650, for instance, who "only"
has a resolution of 8nm, you'd tend to miss peaks that the CS-1000 with its
1nm resolution would catch?
As it was explained to me (by Danny Rich), a properly designed instrument
will never "miss" a peak, it will integrate any light within
each bands extent, and the weighting of the integrations will
sum to a perfect flat line over the total instrument bandwidth.
The issue is with applying the standard observer weightings to
the spectrometer readings to arrive at a visually weighted result.
Each band the spectrometer reads has a "flat" weighting, and the
standard observer curve weighting is applied to the total for
each band, so the effective weighting for a spectrometer will
not be a smooth curve, but a "staircase" that follows the
CIE curves but is "flat" for each band the instrument reports.
If a particular display peak happens to fall at the edge of
a "step" in the actual weighting, and this happens to be on
a steep portion of one of the X, Y or Z curves, then
the error will be largest. The wider the bands, the greater
the error due to the "steps".
Graeme Gill.
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