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

[Paul Viapiano]

Thanks for the clarification, Mark!



----- Original Message ----- 
From: "ender100" <ender100 at aol.com>
To: "editor at p-o-v-image.com, The alternative photographic processes 
mailinglist" <alt-photo-process-list at lists.altphotolist.org>
Sent: Saturday, February 20, 2010 3:39 PM
Subject: [alt-photo] Re: Vertical Banding in Prints Produced from Digital 
Negatives


> Paul, Not pizza wheel marks, roller marks—they tend to show up if you have 
> ink that is thick and not cured where the heaviest ink is, which would be 
> where Amy's skies are in the final print.
>
> Good suggestions Keith, except I wouldn't reduce the ink density and 
> exposure, the blacks in the print will be weak.
>
> Amy, I use a 3800 all the time. When I use the original Pictorico (Premium 
> OHP) I never increase the ink density more than +15. If I am using Ultra 
> Premium OHP. which holds more ink and cures faster I sometimes go up to 
> +30. I have not had the roller problem you described, if that indeed is 
> what the problem is.
> --
> Best Wishes,
>
> Mark Nelson
> Precision Digital Negatives
> PDNPrint Forum @ Yahoo Groups
>
> Mark Nelson Photography
>
>
> On Feb 20, 2010, at 5:31:58 PM, "Keith E. Krebs" <editor at p-o-v-image.com> 
> wrote:
>
> From:   "Keith E. Krebs" <editor at p-o-v-image.com>
> Subject:    [alt-photo] Re: Vertical Banding in Prints Produced from 
> Digital Negatives
> Date:   February 20, 2010 5:31:58 PM CST
> To: "The alternative photographic processes mailing list" 
> <alt-photo-process-list at lists.altphotolist.org>
> 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:
> http://groups.yahoo.com/group/EPSON_Printers/
> and the Multiverse's largest Canon printer User Community at:
> http://groups.yahoo.com/group/Canon-printers
> "For the rest of you out there, the secret is to bang the rocks together
> guys"
>
>
>
>
> _______________________________________________
> Alt-photo-process-list | http://altphotolist.org/listinfo
>
> _______________________________________________
> Alt-photo-process-list | http://altphotolist.org/listinfo
>