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

[Amy Holmes George]

Hi Mark,
> 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.
This is very interesting to know. At this time, my Color Density has not been adjusted (it's "0"). Do you recommend increasing this value?
Also, I'm wondering how much time I should allow for the ink to dry between head passes (as a starting point) . . .
Amy
> Date: Sat, 20 Feb 2010 17:39:30 -0600
> From: ender100 at aol.com
> To: alt-photo-process-list at lists.altphotolist.org
> 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"
> 
> 
> 
> 
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