Digital BW, The Print

Hi Jeff,

>I use a crop of the 51 step wedge that comes with the QTRip
>installation in the OneEye folder.

OK, I see it's still in the package.

> Is there something that you've found wanting with this wedge?

Yes, see http://www.paulroark.com/BW-Info/51-Step-Lab-A-B.jpg 

The pattern of the 51-step file appears to be picking up artifacts.  The
artifacts may be aligned vertically on the paper -- perhaps  caused by
rollers or otherwise in the coating.  The patterns seem repeatable, so I
don't think I'm dealing with a random noise level issue, but it may have the
same impact.

I think the pattern that the 51-step file is arranged in and how it is used
may be accentuating a problem.  I'll be trying a vertical, sequential
version of the file later.  

Frankly, I'm still finding the 21-step a better compromise.  I may use a
dual vertical one for a finals.

Paul
www.PaulRoark.com 


_____________


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" > 

(I'm also trying to figure out a 51-step image that works 
> for linearization.
> More steps should be better if the artifacts can be controlled.)