Digital BW, The Print

Martin,

You wrote:

>... Paul, ... in message #635, gave some RGB values
>for the 50% patch on Piezo and MIS inks ...

Actually, I think the selected area was 20% - 80% on the test strip, so it
was a larger area.  However, the 50% patch should not be that different.

>I was curious if someone had
>similar values for the Spectratone inks for comparison.

I have not tried that inkset.

>Paul, you wouldn't happen to have the
>0%,25%,75% and 100% measurements in your back pocket?

For the MIS and Piezo, they are easy for me to get.  I have the test strip
scans saved.

What follows are the R/G/B readings for MIS and Piezo on Archival Matte test
strips that were scanned on an Epson 1600.  Both test strips had been in
dark storage -- they are the controls for a fade test comparison.  I
measured the RGB values in Photoshop using the Histogram tool after
selecting the patch indicated.  The test strips were likely on different
batches of Archival Matte, which may explain the slight differences in the
0% (paper) readings.  Levels was manually applied to each test strip
separately, so the black values are not comparable.  (Piezo black is darker
than MIS standard black.)  I tried to avoid any clipping of the white or
dark ends.

MIS 0% = 254/255/252

MIS 25% = 196/194/185

MIS 50% = 134/129/119

MIS 100% = 6.8/3.6/3.4

Piezo 0% = 254/254/253

Piezo 25% = 202/204/193

Piezo 50% = 144/148/137

Piezo 75% = 75/78/69

Piezo 100% = 6/5.8/2.4

(Note that Piezo software has no Archival Matte profile, and the Cone Tech
Matte profile prints lighter than a correct profile should.)

It's easy to get overloaded with all the numbers.  That is one reason I
prefer the 20-80% area reading.  That midtone area includes most of what
gives one the sense of color in an inkset, assuming there are no horrible
crossovers, etc.

Paul

Paul,

Thanks for the info!

Martin

--- In DigitalBlackandWhiteThePrint@y..., "Paul Roark" 
<paul.roark@v...> wrote:
> Martin,
> 
> You wrote:
> 
> >... Paul, ... in message #635, gave some RGB values
> >for the 50% patch on Piezo and MIS inks ...
> 
> Actually, I think the selected area was 20% - 80% on the test 
strip, so it
> was a larger area.  However, the 50% patch should not be that 
different.
> 
> >I was curious if someone had
> >similar values for the Spectratone inks for comparison.
> 
> I have not tried that inkset.
> 
> >Paul, you wouldn't happen to have the
> >0%,25%,75% and 100% measurements in your back pocket?
> 
(snip earlier)