Digital BW, The Print

Rem,

>I love the sepia tone recommended by Maurice Hamilton which 
> uses the Channel Mixer thus: 

>Red Channel: R+30, G+70, B+8, C+8
>Green Channel: R+25, G+75, B+8, C+4
>Blue Channel: R+25, G+70, B+15, C-2

>Is there a way that this can be duplicated using the UT2 inkset?

You could probably get very close.

Here is what I did to estimate how close UT2 could come to this.

I first opened a new RGB file in Photoshop and made a middle gray, with RGB
= 127, 127, 127.  I then applied the Channel mixer settings above.  The
eyedropper read the altered middle gray as Lab L=62, a=4, and b=9.

Then I pulled two old UT2 test strips that had been printed with, first,
pure carbon and, second, the sepia toner.  EEM was used for the test strips.
At Lab L=62 (the same density or lightness as the gray patch in PS when the
Channel mixer was applied) the carbon Lab (a, b) = (2.7, 7).  The sepia test
strip at L=62 read (8, 15), using the ColorVision PFP spectro.

I put these two points on a graph with axes a and b.  I drew a straight line
between the 2 points.  That line passed directly through Lab (a, b) = (4,
9).  This is exactly what Photoshop indicates the Channel Mixer settings
above produce.  The mix that should achieve this is 75% carbon and 25% UT2
sepia toner.

So, for UT2, a curves set made up of mostly carbon (green curve in
Photoshop) and a lesser amount of sepia (blue curve) should do the trick.

Hope this helps.

Paul
www.PaulRoark.com