Re: evaluating identical media in incorrect lighting conditions
Re: evaluating identical media in incorrect lighting conditions
- Subject: Re: evaluating identical media in incorrect lighting conditions
- From: "john c." <email@hidden>
- Date: Wed, 28 Jan 2004 08:51:36 -0500
I think you cracked the case. RA4 processing variations can certainly occur
even within hours let alone a week. I'd see if they could re-image and
process a small print at the same time as a large one to rule out some of
the other answers and so prove that it's processing.
john castronovo
----- Original Message -----
From: "CitizenRay" <email@hidden>
To: "John MacDonald" <email@hidden>;
<email@hidden>
Sent: Tuesday, January 27, 2004 11:28 PM
Subject: Re: evaluating identical media in incorrect lighting conditions
>
What you describe may be, and I think likely, the result from a
>
problem in the bleach-fix. Leuco-cyan dye is a colorless
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form of the cyan dye caused by poor bleach-fix performance.
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Prints with leuco-cyan dye will appear to have a reddish cast
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in the higher neutral-density regions of the images.
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The most common cause of a leuco-cyan dye condition is
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low bleach-fix pH. This can result from overreplenishment
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of the bleach-fix tank or from incorrect pH.
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>
>
Refer to the document at Kodak.com: Process Monitoring and Troubleshooting
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with KODAK PROFESSIONAL Pro Strips Color Negative Paper Control Strips /
for
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Process RA-4
>
>
Viewing conditions make a big difference to this phenomenon as does time.
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Both of which you've encountered.
>
>
It's not your imagination. Scan your sample print using a flat bed scanner
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and compare that scan against a Kodak IT-8 paper target using the same
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scanner at the same time. The scanned results should show much more red in
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the suspect print paper.
>
>
Hope this helps,
>
>
-Stephen Ray
>
>
>
>
> We printed some files on a Lightjet last week. We made new prints from
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> the same files this week. Some of these new prints were 200 percent
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> enlargements, some had slight color corrections made to them, and some
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> were unchanged from the first.
>
>
>
> When I viewed them in unbalanced light, the new ones all looked
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> significantly redder, far enough that it would be unacceptable to the
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> client. When I viewed them in balanced light, the new ones only looked
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> slightly redder and were acceptable. So while the new ones did not
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> exactly match under either light, they were acceptable under a balanced
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> light source and unacceptable under an unbalanced light source.
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>
>
> I am hoping someone can confirm that this is possible and not just my
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> imagination.
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>
>
> Thanks!
>
> John
>
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