Digital BW, The Print

Paul,

I'm new to this users list, so here's a couple questions:

1. What is BO printing?
2. On your chart, is the Y axis something like a difference from 
expected value in db, or some other unit?.

thanks,
Roger
Palmer Lake, CO

pr_roark wrote:
> 
> 
> 
> I thought some might like to see a graph of the Lab A & B values that
> I'm getting from a 21-step test strip printed with an R220 and the
> Eboni-6 inkset on Premier Art Smooth BW paper. I've posted a Jpeg of
> the Lab A & B graph, as well as small samples from 1600 dpi scans to
> compare smoothness.
> 
> See http://www.paulroark.com/BW-Info/220-Eb6-PA-BW-Lab.jpg 
> <http://www.paulroark.com/BW-Info/220-Eb6-PA-BW-Lab.jpg>
> <http://www.paulroark.com/BW-Info/220-Eb6-PA-BW-Lab.jpg 
> <http://www.paulroark.com/BW-Info/220-Eb6-PA-BW-Lab.jpg>>
> 
> The base for dilution here was 35% glycerin, 55% distilled water and 10%
> Kodak Photo Flo.
> 
> Home darkroom work might take an interesting twist here. Just like the
> developer days, different mixes cause different reactions to the tone of
> the print -- with pure carbon and just these safe, readily available
> substances. One tradeoff is also smoothness v. tone. There are
> interesing variables here that allow the tuning of a 100% carbon inkset
> to a particular paper for a particular tone and printer.
> 
> Paul
> 
> www.PaulRoark.com <http://www.PaulRoark.com <http://www.PaulRoark.com>>
> 
> [Non-text portions of this message have been removed]
> 
>