Digital BW, The Print

Tony Terlicki wrote regarding the 1160 RGB partitioned curve:

<snip>
>The 100% patch has very good dmax at about 1.54 according to my 
>densitometer but the 95% patch then drops off quite quickly to 1.32 
>with 90% at 1.17. <snip>


Tony:

I am surprised that you measured such a large drop in density between 
100 and 90%. Bob Morrison used his spectrophotometer/densitometer to 
measure the ink densities of stepwedges and found densities of 1.63 @ 
100%, 1.55 @ 95%, and 1.46 @ 90%. No one else has reported such a 
large dropoff. Note: Bob's measurments and plots of density vs 
grayscale are contained in the profile_make2.pdf document at Files> 
Ink Sets> MIS> MIS FS.

Are you using a standalone spectrophotometer/densitometer, or are you 
using the readout tool on a scanned image of the printed stepwedge? 
If using standalone hardware, are you sure it is properly 
calibrated? Typical max densities of MIS FS K ink on EAM/EEM range 
from 1.6+ to 1.7. I suspect something is amiss with your setup or 
methodology.

Jeff Randall