Digital BW, The Print

Daniel Staver wrote:

> If you print a picture with a deep blue sky using UC inks you'll easily 
> see a shift from purplish blue to cyan if you move from fluorescent to 
> daylight. This is consistent with the shift you would see with a 
> "neutral" print printed with the Epson driver. This could indicate that 
> either the cyan or the magenta inks (or both) are the cause of 
> metamerism, not yellow.

Daniel,

The UV content in true daylight will be difficult to cut out with 
any profiling. The only way then is profiling at 6500K or higher 
and not using a UV filter in the Spectrometer. Then it will fit 
the daylight condition but no other environment (and the inks 
will not last long either in daylight). So a compromise is used 
with 5500K and the discussion continues whether a UV filter 
should be used in the Spectrometer and whether it should be in 
front of the light source (SpectroCam for example) or in front of 
the sensor.  If there's no information of the display conditions 
then 5500K and no UV filter is the best choice in my opinion. Not 
mentioning the effects of OBAs in the paper/coating when UV light 
is around and laminations/varnishes that block the UV light. 
Problematic metamerism happens already at indoor conditions, I 
doubt there's an ink that will not metamerise when used outdoors 
if profiled at 5500K.

Ernst