[argyllcms] Re: DIY reflective spectro

Rene Bartsch wrote:

The idea is to send a laser beam on a surface and measure the DIFFERENCE between
origin beam and reflected beam.

The difference of wavelength should give a hint to the color of the surface, the
difference of intensity a hint to the brightness.


For any non Fluorescent surface, one would expect zero change in wavelength.

Expensive (generally older) reflective instruments do a two way reading,
where they (either) simultaneously using a splitter, or sequentially using
a mechanical optical switch, read the level of their light source
and the level of reflected light. Lower cost and more modern instruments
tend to avoid this complexity, making do with a manual calibration
at the start of each session. Techniques for improving light source stability
have improved.

Graeme Gill.

Other related posts: