Bronzing and Lab ab values with 0/45 degree spectrometer optical geometry
2011-12-02 by Ernst Dinkla
Mixing HP Vivera PK for B&W thermal head inks and trying to get rid of bronzing some issues appear in spectro measurements. With an Eye 1 Basic without the UV cut filter I already get different (but possibly more exact) ab values than users of other spectrometers or colorimeters get but I also wondered about the influence of bronzing on spectrometer measurements. I got one hit while googling (Datacolor) that confirmed my suspicion; bronzing does influence the spectrometer results. No wonder given the common 45 reflective angle used in the optics. So be careful and use your eyes as well in cases like that. It may not have much influence on the greyscale steps measurements but the ab values translated to the softproof is not 1:1 to the actual color at the normal viewing angle. Another reason to get rid of bronzing. -- Met vriendelijke groeten, Ernst http://www.pigment-print.com/spectralplots/spectrumviz_1.htm | Dinkla Grafische Techniek | | www.pigment-print.com | | ( unvollendet ) |