Digital BW, The Print

Hi Clayton,
I'm a newbie to the list. I've noticed that effect directly on Concord
Rag when printing BO with a 1200. The 000 density visually appeared
significantly lighter than a 10,10,10 patch in a 21 step scale I had
been trying to make linear to separate tones via a curve. I attributed
it to filling in the surface coating and changing it's reflectivity. I
don't know what a densitometer would have shown. Concord is the only
paper to date I have used thats done that.

Best,
Duane



-- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Clayton Jones"
<cj@c...> wrote:
> Hello All,
> 
> I have an image, a still life, worked up to my satisfaction in PS
> using EEM proof paper. The background is solid black, RGB 0 all over.
> Can't get any blacker than that.  When I print this (BO with Eboni)
> on PR I get what you'd expect - a very deep intense black background.
> 
> Now I'm testing a new paper and with the same image the background
> looks considerably weaker, so I conclude that this paper has poorer
> Dmax than PR.  Just to experiment, I add a curve layer and give it a
> bit of a contrast boost to see what happens.  This is a typical
> S-curve where the black and white anchor points are not moved.  So all
> 0 pixels in the background are still zero.  Theoretically nothing in
> the background has changed (the rest of the image _has_ changed, of
> course).
> 
> Now when I print this, the background Dmax has increased considerably,
> enough to where I'd think it was a different paper.  What has happened
> here?  How can more ink have been put down in an area that was already
> solid black?  Of course the other part of the pic is too contrasty -
> you can't make a silk purse out of a sow's ear.  But I'd sure like to
> understand better what's happening.  Anybody know? 
> 
> Regards,
> Clayton
> 
> 
> Info on black and white digital printing at    
> http://www.cjcom.net/digiprnarts.htm