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

[Philippe Berger]

I am Epson R800 + OHP Pictorico + Sofware "PhiLou"

The gigital negative for the Carbon is perfect

Philippe


----- Original Message ----- 
From: "Greg Franco" <gfrancophoto at gmail.com>
To: <alt-photo-process-list at lists.altphotolist.org>
Sent: Sunday, February 21, 2010 8:42 AM
Subject: [alt-photo] Re: Vertical Banding in Prints Produced from 
DigitalNegatives


> Hey Amy,
>
> How many inks are you using?  Just black or full color set?  I have found 
> banding to occur if only using one or two inks... hard to see with your 
> eyes.. but the subtle differences in the UV absorption of each ink can 
> cause the banding on your print when they are blended by the printer.  I 
> had this happen when using just the yellow and black inks in a QTR profile 
> for my Epson R260(since the other inks in the set didn't show much ability 
> to absorb UV in my tests).  But the sum was greater than the parts and I 
> ended up eliminating the problem by using profiles that used all 6 inks.
>
> Greg
>
> Message: 9
> Date: Sat, 20 Feb 2010 17:58:12 -0500
> From: Amy Holmes George <amyhgeorge at hotmail.com>
> To: <alt-photo-process-list at lists.altphotolist.org>
> Subject: [alt-photo] Vertical Banding in Prints Produced from Digital
> Negatives
> Message-ID: <SNT131-w41C7A142ED6BDE2F20054ACF450 at phx.gbl>
> Content-Type: text/plain; charset="windows-1252"
>
>
> Hello all,
> I would gladly welcome any suggestions you may have regarding a recurring 
> issue. I am printing digital negatives on Pictorico transparency film 
> (Ultra Premium) with an Epson 3800 for use with pt/pd on COT 320 (and 
> exposing in a Nuarc). For some reason, I am seeing a predictable pattern 
> of vertical bands visible only in flat areas of high value such as the sky 
> (please refer to attached jpg). This banding is not visible in the 
> negative?even under magnification, and it is not specific to any one 
> image. To me, the only logical explanation is my printer. So, I have 
> performed a nozzle check, head cleaning and head alignment, but all the 
> test results indicate no problems. I have even wiped down the interior 
> according to the Epson printer manual instructions, and still the problem 
> persists. What could cause this banding? I am out of ideas and feeling 
> rather frustrated . . . help!?
> Thank you,Amy
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