Re: Spectrolino as a densitometer
Re: Spectrolino as a densitometer
- Subject: Re: Spectrolino as a densitometer
- From: Graeme Gill <email@hidden>
- Date: Thu, 29 Aug 2002 16:20:10 +1000
email@hidden wrote:
>
Spectral data is not required to determine density, or else densitometers
>
would have to be spectrophotometers!
Densitometers apply various filters to the reflected light in front
of their 3 sensors. The spectral shape of those filters determines
what sort of density readings you get (status ABC etc). Lab
readings are determined using yet another set of 3 spectral
filters. You can't accurately convert from one set of filters
to another, without the original spectral (pre-filtered) data.
With a spectrometer, you are reading the spectral (pre-filtered)
light values, and you can therefore apply any filter set you like
mathematically, to end up with whatever density or other 3 component
colorspace you like.
Graeme Gill.
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