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: CitizenRay <email@hidden>
- Date: Tue, 27 Jan 2004 20:28:36 -0800
What you describe may be, and I think likely, the result from a
problem in the bleach-fix. Leuco-cyan dye is a colorless
form of the cyan dye caused by poor bleach-fix performance.
Prints with leuco-cyan dye will appear to have a reddish cast
in the higher neutral-density regions of the images.
The most common cause of a leuco-cyan dye condition is
low bleach-fix pH. This can result from overreplenishment
of the bleach-fix tank or from incorrect pH.
Refer to the document at Kodak.com: Process Monitoring and Troubleshooting
with KODAK PROFESSIONAL Pro Strips Color Negative Paper Control Strips / for
Process RA-4
Viewing conditions make a big difference to this phenomenon as does time.
Both of which you've encountered.
It's not your imagination. Scan your sample print using a flat bed scanner
and compare that scan against a Kodak IT-8 paper target using the same
scanner at the same time. The scanned results should show much more red in
the suspect print paper.
Hope this helps,
-Stephen Ray
>
We printed some files on a Lightjet last week. We made new prints from
>
the same files this week. Some of these new prints were 200 percent
>
enlargements, some had slight color corrections made to them, and some
>
were unchanged from the first.
>
>
When I viewed them in unbalanced light, the new ones all looked
>
significantly redder, far enough that it would be unacceptable to the
>
client. When I viewed them in balanced light, the new ones only looked
>
slightly redder and were acceptable. So while the new ones did not
>
exactly match under either light, they were acceptable under a balanced
>
light source and unacceptable under an unbalanced light source.
>
>
I am hoping someone can confirm that this is possible and not just my
>
imagination.
>
>
Thanks!
>
John
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.