[alt-photo] Re: Vertical Banding in Prints Produced from Digital Negatives

[Keith E. Krebs]

As you're printing with pigmented inks on a transparency film, and 
finding the banding in high-value areas, I'd bet on oversaturation of 
the transparency film. Whether or not they are actual roller marks, is 
secondary to the fact that without high ink-density on a low-absorbency 
medium, you probably wouldn't be getting the banding.

Simple solutions:

1) Slow the printer head speed

a) if you can choose uni-directional printing

b) Slow down passes by choosing increased drying times if the drivers so 
allows

2) Lower overall negative densities and shorten your exposure times 
accordingly

It's possible that it's a printhead alignment issue. You can run a 
printhead alignment to eliminate that possibility.
 

 
Keith Krebs

"Just some guy," caretaker of the Multiverse's largest EPSON printer 
User Community (highly recommended by Vogon Poets and MegaDodo 
Publications), at:
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"For the rest of you out there, the secret is to bang the rocks together 
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