Digital BW, The Print

Gareth,

I have a similar problem using the MIS variable mix quadtones with 
Somerset Enhanced Satin paper. The mid tones are blocked.  

Paul Roake suggested adjusting the curve by using a transfer 
function.  This is available in the full version Photoshop and MIS 
have a link to Jerry Nevins Tutorial.

http://www.jnevins.com/transferfunctioncurve.htm

Regards

Garry Bisshopp



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In DigitalBlackandWhiteThePrint@yahoogroups.com, "garethlock4472" 
<g.loc@o...> wrote:
> In reply to my previous message re: curves vs profiles I decided to 
> do some experimenting! 
> 
> I set up my monitor using Adobe Gamme several times and got 
something 
> which looked right however for me to see the full 90-100% in 1% 
> segments I had to have the gamma turned right up which blew 
> everything else out and I did not get true blacks (more of this 
> later).
> 
> I have just printed out a great test chart which has 0-100% in 5% 
> steps, 1-10% and 90-100% steps in 1%, and 0-10% and 90 to 100% in 
2% 
> steps.  When printed without a curve the mid-tones are blocked up 
and 
> I cannot even get past 90% without seeing pure black.  The NCA-gs1 
> curve allows me to get even tones all the way through to 94% and 
then 
> I cannot discriminate any further.  The NCA-nc1 curve doesn't quite 
> get as far 92% before blacking out.  
> 
> I can see how the GS curve works because it is one channel (not 
going 
> to even attempt the colour curves!).  How easy is it to modify this 
> curve to allow the 94-99% be lightened to see the delineation 
between 
> the sections?  The gs1 curve has 16 points including 0 and 255 and 
5 
> points within the first quarter of the graph; these obviously do 
not 
> match linear steps.  When you are modifying something which is 
tucked 
> right in the bottom left of the graph things don't seem to move on 
> the screen.  It doesn't help that on screen I cannot see past 92% 
> anyway!
> 
> Any ideas from the collective wisdom?
> 
> Gareth
> 
> PS The fianl print settings were:
> 
> Colour Space Assigned: AdobeRGB 1998
> Source Space: Adobe 98
> Print Space: Same as source (When using the Epson 1270 profile it 
is 
> pure black from 85%!)
> Paper Setting: HWM
> Dpi: 1440
> NCA in Driver