Digital BW, The Print

Paul, are your figures % of dmax?  Or did you correct for the log scale?
Just trying to figure out how they correspond to mine changes.

Robert

On 9/12/01 8:53 AM, "Paul Roark" <paul.roark@...> wrote:

> Mike,
> 
> You asked:
> 
>> Has anyone else measured the actually loss in density of Piezo prints?
> 
> I ran a comparison fade test in my florescent light tester with MIS
> (standard quads) and Piezo inks.  Both were on Epson Archival Matte, and
> both were in the fader at the same time, so other possible variables were
> kept to a minimum.  After 300 hours the MIS 50% patch had lost 4.6% density.
> The Piezo test strip had lost 7.6% in the 50% patch. (The two blacks had
> both faded 15%, but because of the intensity of the light, the black would
> absorb more and heat up more.  So, I think the test conditions exaggerate
> the relative fading of the dark tones.)
> 
> For most parameters I'm looking at, by 300 hours in my fader the rate of
> change has slowed considerably.  So, while these prints may never totally
> stabilize, I think at the 300 hour point we can see what the prints will
> look like after the prints have "warmed" completely.
> 
> While the Piezo faded 65% more than MIS, neither had really faded that
> dramatically.  I continue to agree with the consensus of south-window
> testers that color shifting is more significant than fading.  I'll send the
> scans of the test strips and control strips to Martin to put in the files
> section of the forum.  (See Fade-MIS-Pzo-300Hr.jpg)
> 
> I would be curious if the scanned images look like what south-window testers
> see, and how long it takes for south-window prints to take on this color.
> 
> EAM is the champ when it comes to fade resistance among the paper I've
> tested.  I don't know what paper was being used below, but the alleged 2
> stop fading in 60 days seems extreme.  I would guess there are some factors,
> perhaps including display conditions, that we don't know about.
> 
> Paul
> http://www.PaulRoark.com
> 
> ______________________________________________
> 
> 
> -----Original Message-----
> From: Michael J. Kravit [mailto:kravit@...]
> Sent: Wednesday, September 12, 2001 5:16 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] Piezo - Loss of Density
> 
> 
> Last eveing I was speaking with another photographer by telepone. He
> told me that in California Huntington Witheral is ready to give up on
> Piezo because his display prints are losing 2 stops of density after
> just 60 days on display.
> 
> Supposedly he has spoken with Jon Cone and Cone told him it was his
> paper. So he has tried numerous papers and has not been able to keep
> the prints from losing density (fading).
> 
> Has anyone else measured the actualy loss in density of Piezo prints?
> 
> MIke
> 
> 
> 
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> resources as they are often being updated. The page is at:
> 
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> 
> 
> 
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----------------------
Robert Morrison
rmorrison@...

310-397-2704

4131 Bledsoe Ave.
Los Angeles, CA 90066