Digital BW, The Print

Dan,

Actually I should have addressed my question to Paul, who in message 
#635, gave some RGB values for the 50% patch on Piezo and MIS inks 
which Antonis translated to HSB values. (Don't know how your name got 
in there. I blame it on the Absolut.) I was curious if someone had 
similar values for the Spectratone inks for comparison.

I know that this is a single point sample of a complex system and may 
be of little or no value, but being an engineer I have this stupid 
obssession with numbers. Paul, you wouldn't happen to have the 
0%,25%,75% and 100% measurements in your back pocket? It would be 
interesting to compare how the color of each ink set shifts with 
image density.

Martin


--- In DigitalBlackandWhiteThePrint@y..., Dan Culbertson 
<danculb@b...> wrote:
> 
> > Antonis, (or Dan),
> > 
> > Do you have a reading for the Spectratone inks? I would be 
curious to
> > see how they compare.
> > 
> > Martin
> 
> I must have missed the original post since I don't know what this 
and the
> clip that preceded it refers to.  But if it is a way to measure the 
color
> difference in gray ink and papers I don't think there is a single 
number
> that does it.  Best bet is a spectral comparison of a fifty percent 
patch
> with a reading from a grayscale card.  But that doesn't tell the 
whole story
> since each light color impacts the result.  However, assuming a 
standard
> light source, and using ColorShop's spectral comparison we could 
get a delta
> e reading between a gray card and any ink/paper combo.  But quite 
frankly
> this sort of numerical comparison doesn't do much for me - not 
broad enough
> to get the true understanding of tinted appearance.  Possibly a set 
of
> readings compared to the gray patches on a Macbeth chart would be 
good.
> 
> -- Dan Culbertson
> so many years, so little time...