Re: Colorimeter vs. Spectro
Re: Colorimeter vs. Spectro
- Subject: Re: Colorimeter vs. Spectro
- From: Graeme Gill <email@hidden>
- Date: Wed, 05 Jan 2005 02:10:33 +1100
- Organization: Argyll CMS
Marc Levine wrote:
colorimeter and spectrophotometer have different missions in life. For a
spectro, the system is geared to deliver a discrete set of spectral points
that represent a color sample. Yes, I would agree that most spectophotmeters
do see the data that is in between those discrete points. However, because
the task is to report these discrete points, the data in between those
points can be heavily "discounted". After all, a system does need to handle
I hope that's not the case for a reputable spectro. It's really dumb to
point sample if you can do something else; point sampling always invites
aliasing. Given the nature of many low cost spectro's, I would
expect that the "gap" between samples was rather small, being a function
of the "gap" between the CCD cells, moderated by any slight de-focus.
In a well made spectro I'd hope that the total energy recorded for a
narrow band source remains the same, whether it lands exactly on a nominated
measurement band, or whether it lands between two (ie. that the sum of the
spectral sensitivity curves for each measurement band is a straight line).
This would be consistent with the CIE recommendation for computing
tristimulus values of sources that have rapidly variation with wavelength.
Graeme Gill.
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