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Re: Colorsync-users Digest, Vol 4, Issue 347
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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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 >Re: Colorsync-users Digest, Vol 4, Issue 347 (From: Roger Breton <email@hidden>)

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