Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Peter Baumbach" 
<info@p...> wrote:
> Hi Roy,
> 
> many thanks for the update. Now the highlights are MUCH better (7600 
> with UC matte)! Nevertheless a few questions:
> 
> - Which dithering algorithm do you recommend ? I was using "Adaptive 
> Hybride". The lighter black ink patches of the ink pattern page do 
> not print uniformely. What might be the reason ?

Adaptive Hybrid is set as the default but I've been mainly using Ordered.
The ink pattern page isn't very representative of real images -- high
contrast in the highlights and only one ink at a time.  Multiple inks tend
to hide the dithering.

> 
> - The overall neutrality could be better. I made a warm and a cool 
> curve and tried different mixtures. But there seems no way to get a 
> real neutral print. Some midtones have a tendency to print cool, 
> other are warm. How could I improve the neutrality ?

If you print out a stepwedge are you getting a clear transition from cool
to warm or vis versa?  The basic idea of the ultrachome curves is to
put light-magenta and light-cyan in direct proportion to light-black which
has most of the warm tone.  A slight selenium tone can be done by making
the light-magenta ink slightly more than the light-cyan.

The lighting can still cause a small amount of metamerism.

Can you measure the neutrality from light to dark or are you just going by eye?

Roy

> 
> Many thanks again,
> Peter
> 
> 
> peter baumbach - fine art photography
> http://www.pb-photo.com
>