On 1 Oct 2004, at 13:13, Michael Wilkinson wrote:
Surly a scanner with separate RGB light sources will perform correctly
Spectrophotometers measure the wavelengths of a known light source that reflect off a surface (patch), across the entire visible spectrum often including measurements beyond the visible spectrum to account for the effect of fluorescence. They take between 20 to 400 odd measurements per patch. This can be repeated and the results averaged for greater accuracy. The data covering the entire spectrum is ultimately translated into RGB values.
Scanners measure the red green and blue component of whatever they are scanning, well or badly (partly depending on how much you spent on them).
Having loads of information and reducing it down to what you need is inherently more accurate than taking a bit of information (with a tool that wasn't designed to do measuring.)
Accuracy in anything costs. Cheap profiles are not accurate. Expensive profiles may be cheap profiles that someone is charging a lot for, or expensive because they actually are accurate.
Matthew Ward
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