Two channels, one for calibration. Light would be brought to sample by fiber attached to head, thereby solving the gloss/flare issue. . Light constancy would be the responsibility of the operator. Anyway, I think I've seen some such contrivances around. Did you ever take apart an EyeOne? On Tue, Jul 12, 2011 at 11:43 PM, Klaus Karcher <lists@digitalproof.info>wrote:
edmund ronald wrote:
My contribution: I see no reason why a spectro cannot work with an external light source, even room light, given fiber optic technology.
Calibration? Gloss? Flare? Reproducibility? Measurement conditions (measurement geometry, temporal constancy of external light)?
Getting results /repeatable/ in the ∆E < 1 or just < 3 ... 5 range with (arbitrary) external light sources is no walk in the park -- that's for sure.
Klaus