Digital BW, The Print

Bernhard,

Dirk Hobman wrote a nice tutorial on how to tweak curves that has been
posted at http://www.inksupply.com/index.cfm?source=html/whatsnew.html.


>> On warmer papers, the FS-N might be closer to neutral and the UT
>> might be a bit warm.  The curves of the UT inkset, of course,
>>can be tweaked to get a more even tone than the FS-N.

>At which color to start and how to edit it exactly?

The toner is in the yellow spot on quads, the magenta spot on hextone
printers.  I'd start by just pulling the toner curve down to add more toner.
It is a very light ink, so it will not add that much density.  You can
offset the density, however, by moving the light gray (quad magenta, hex
yellow) the other direction by the same amount.

>...My understanding of the phenomenon was that the 3 colors don't
>have the same grade of warmth, so according to which one is most 
>used in the print it seems warmer or cooler ...

The toner is a light, low gamut blue ink that is in only one color position.
It is used to cool down the warm carbon inks in the other positions.
However, the distribution of the toner is done by the RGB curves only in the
printing workflow.  The original grayscale file should end up having the
same hue/tone throughout its midtones. 

>Is it absolutely necessary to first convert to BW and then back to RGB? ...

I recommend it.  If the original file is RGB and carrier any of that
information over to the final printing file, it will throw the system off. 

Paul
www.PaulRoark.com 




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