Digital BW, The Print

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 the =

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 (accessible =

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 different =

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 observation=

> that the Piezo Archival Matte test strip has a slight greenish tint.  The=

> green reading of the Piezo test strip is elevated.