Digital BW, The Print

Comments below added by Jim Hayes... :-)



--- In DigitalBlackandWhiteThePrint@y..., 
> on 11/17/01 11:23 PM, Cort Anderson wrote:
> 


> > What exactly does DSS and DDS stand for?

DDS stands for typos on the part of respondants. The only thing I know 
of it standing for is Doctor of Denistry. Unless you have a 
toothache and are feeling grouchy enough to complain of it on list, 
please avoid this typo as it apparently causes confusion.<G>

DSS is the proper acronym, it stands for "Density Shift Syndrome". It 
was formerly called "Hayes Syndrome", and theories as to why it 
occured were referred to as "Dunn-Kravit Hypothesis" Knowing these 
three terms, you can do a exhaustive search in the Piezo 3000 forum to 
root out just about all posts. Please do not equate it with "green 
tone". This is a common mistake.  It has nothing to do with the one 
time proposed "green print" problem, except that that DSS does have a 
symptom where the print can appear green in certain circumstances. But 
I tell people to discount this symptom to avoid confusion, and because 
color perception varies from person to person. There are plenty of 
other symptoms to nail down the ailment.


 I understand the 
problems/
> > symptoms to be a green shift and clogs in the print heads

Wrong!!! See my comment about green tone above. CLogs are NOT a 
symptom of DSS except that when you have reached "terminal stage" 
difficult clogs can occur. Green tone and clogs are SOMETIMES 
symptomatic of DSS when it has reached terminal stage, assuming you 
have the other symptoms. In fact, you will most likely get PERFECT 
nozzle checks up to terminal stage and possibly beyond. Terminal stage 
is when DSS reaches a dramatic, sudden explosive increase of volume of 
symptoms within a day or two, or a couple of prints.

Again, the symptoms: 1:flattening of midtones. 2: Overall lighting of 
print. 3:Compression of highlights and shadows. Although the print is 
lighter, you may find there is not much difference between 85%k and 
95%k...85%k looks as if it got as dark as 95%k I mean. This is also 
expressed as loss of detail in highlights and shadows. 4: 
Posterization. 5: Increase in contrast, sometimes expressed as a 
"roughening" of tonal transistions like cement walls and grainy 
images. 5: A greenish cast may begin to appear in advanced stages, I 
see it most in midtones. You are approaching terminal stage at this 
point. 6: AT terminal stage, the print looks absolutely horrible, but 
some people, including me get horrible clogs as well, to the point 
that drastic measures need be taken. I also got ink blotting over my 
print. A mess. Other people don't have it as bad.

Notice that the green cast symptom and the clogging problem are 
qualified as "may" and "some". And that these symptoms are listed 
last, and as only occuring near terminal stage.

Look for symptoms 1 and 2, they are the most noticable. Some people 
saw number 4 first.

 and that 
they
> > are usually related to CIS

This is not confirmed, and should not be taken as fact. I know of one 
person who had what appears to be DSS with Piezo inks in carts. It 
went away when he switched to CIS AND a competitor's inkset. He has 
printed a LOT since then without problems.

There are a few statisical fallicies (I think) which would need to be 
ironed out to be able to query people as to whether they have more DSS 
with carts or CIS, and get a meaningful answer.

 but have been unable to figure out what 
the
> > letters mean.

<Todd's comments and Jims...>

> 
>  Fellow named Jim Hayes coined it. I think it's Density Shift 
Syndrome,

Yes.

 or
> something like that. DDS has something to do with dentistry if I'm 
not
> mistaken. ;-)


<GG>
Jim H.

> 
> Todd