Digital BW, The Print

> 
>>The pigment in that grey is 
>>not the Eboni kind and gives more reflection than the Eboni 
>>pigment. If I measure the unlinearised BO greyramp of the Eboni 
>>then I see no Dmax drop at the highest inkload.
> 
> 
> I believe BO will always give higher dmax with pigments, possibly
> because of paper load issues. On any printer, the unlinearized
> black ramp ends up with higher dmax than the profiled ramp where
> grays come in. I tend to think it's about how wet the paper gets and
> whether it can hold equally the black and the gray. By bringing
> in a gray, it accepts less of the black, hence its tricky to profile
> quad shadows.


Antonis,

I had doubts about my own observation but with the default ink 
arrangement of the UT VM I could add more grey ink without a drop 
in Dmax. Now I only use a 1% addition to get rid of any white 
lines that may occur but this Magenta head produces a very 
homogene black anyway. No drop in Dmax with that amount of grey 
addition.

It isn't very scientific when several parts of the setups are 
exchanged and the outputs changed per head so forget my theory.

The only thing that I learned from this experiment is that it may 
be wise to check which channel delivers the highest output and 
select that one for the black.  If the driver allows it of 
course. Your data give a nice reference.

Ernst