Digital BW, The Print

William:

The best place to start is to open one of Paul Roark's RGB 
partitioned curves for the hextone VM inkset and your printer (see 
the Quad workflow pages at MIS, www.inksupply.com for curves and 
workflows) .  Check out the individual R, G, and B curves with your 
photoeditor's curves tool.  The R curve controls the C position inks, 
G the M position inks and B the Y position ink.  Tweak the curves to 
get a smooth stepwedge and ramp on your printer.  You can do this 
visually, scanning the stepwedge portion of the test print with a 
flatbed scanner and checking the positions of the peaks with the 
histogram feature of your photoeditor, or directly measuring each 
step patch with a densitometer, colorimeter, or spectophotometer.

Good Luck.

Jeff Randall



 

--- In DigitalBlackandWhiteThePrint@y..., william oldacre <me@w...> 
wrote:
> Hi all,
> 
> I've looked in the forum briefly and I'm not finding anything that 
> indicates a method for writing curves. Could anybody point me in 
the right 
> direction or brief me on the method for writing curves.
> 
> Do you need to isolate each of the 6 inks and figure out the 
crossover 
> points or what exactly?
> 
> Thanks
> William
> 
> Best regards
> 
> William Oldacre
> 
> me@w...
> 698 Queen Street East
> Toronto, Ontario    M4M 1G9
> Canada
> 
> www.wfomixedmedia.com/portfolio
> 
> studio    (416) 405-9929
> fax        (416) 778-6200