Digital BW, The Print

Paul,

Yes, on further reflection I see the merit in what you did. For one thing
you increased the likelihood of localized artifacts to show up by putting
them in two places rather than one, and you first decreased the contrast of
the target which allowed you to then increase it to heighten the flaws.
Makes sense.

Thanks.
Todd

> Todd,
> 
>> Could you run through your reasoning/methodology one more time? I thought
>> the smooth grayscale/step-wedge was already a good representation of a
>> challenging print. I'm not sure I follow why you took the extra steps you
>> did.
> 
> I think that subtle problems in prints of the 21-step test file ramp may not
> be obvious in that test, but do show up in some prints.  Not infrequently, I
> hear of trouble with subtle gradations where the test print from the person
> looks OK.  I think we also heard the conclusion from a forum member that in
> comparison with wet prints, the inkjet prints don't do well with low
> contrast subjects.
> 
> So, I wanted to find a test that would show more subtle deviations in the
> ramp.  The basic idea was to neutralize the ramp itself with the gradient
> going the other direction, and then raise the contrast to show the
> deviations more clearly.
> 
> I think the procedure works.  It might be that where someone says a print
> looks odd at a certain area, taking a test print from the same printer and
> workflow, this procedure would be able to identify the problem where just
> looking at the ramp it is not clear there is a problem.
> 
> Anyway, I thought it was an interesting exercise.  My Piezo ramp is sure far
> from the perfection that some claim for that workflow.
> 
> Paul
> http://www.PaulRoark.com
> 
> 
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