Digital BW, The Print

I want to thank Paul for his detailed response on the mis/piezo 
comparison.  It's great that Paul (and Antonis) have found the time to 
do the research.  I think I'll turn on my platinum printer UV source 
and throw a few sample prints under it for a few days.  That is 
certainly an accelerated sunlight exposure.

Meanwhile, I ordered MIS variable tone inks and a continuous inking 
system.  At $125 vs. Cone's $650 for start-up costs, it is certainly 
cheaper to try MIS first.

Frank

http://www.culturalvisions.com


--- In DigitalBlackandWhiteThePrint@y..., antonisphoto@y... wrote:
> Paul,
> 
> it may be more instructive to look at the numbers in HSB instead of RGB.
> In the case of the numbers you cite:
> 
> RGB 140/143/132     =     HSB   76º/8/56
> RGB 132/129/121     =     HSB    44º/8/52
> 
> Using HSB allows us to take out the relative brightness (56 vs 52) and th=
e =
> 
> even saturation (8) and concentrate on what a tremendous difference the 
> position on the color wheel shows from 76 to 44 degrees. 
> For anyone interested in seeing this, look at the Color Picker (accessibl=
e =
> 
> when you click on the current color in PS) and notice the color bar next =
to=
>  the 
> square with the spot where your color is. That vertical bar gives you the=
 
> position of the big square to the left in relation to where on the color =
wh=
> eel you 
> are located.
> 
> I have been preparing some spectrophotometric data on piezo with differen=
t =
> 
> papers and that's what I have been using to illustrate color shifts in 
> monochrome prints. Huge differences, when viewed that way.
> 
> What do you think?
> 
> 
> Antonis
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@y..., "Paul Roark" <paul.roark@v...> =

> wrote:
> 
>  However, here are the R/G/B readings I get with Piezo and MIS
> > Archival Matte test strips (essentially the same age and stored in the
> > dark), reading the midtone values from 20% to 80% using the Photoshop
> > Histogram tool and an Epson 1600 scanner:
> > 
> > Piezo R/G/B/ = 140/143/132
> > 
> > MIS R/G/B = 132/129/121
> > 
> > I think that these readings are consistent with my subjective observati=
on=
> 
> > that the Piezo Archival Matte test strip has a slight greenish tint.  T=
he=
> 
> > green reading of the Piezo test strip is elevated.