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 MacDonald <email@hidden>
- Date: Tue, 27 Jan 2004 15:09:34 -0500
- Organization: Dodge Color, Inc.
It's that "may not be off in the same way" thing I'm talking about.
Here's the example that got me asking:
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
Roger said:
It may not be off in the same way, you're right. According to my knowledge,
it's a function of each samples colorants. If each samples is made with
different colorants AND it matches under a certain illuminant there is no
guarantee that it will match under a second iluminant. If each sample is
made with the same colorants then, by definition (please someone correct me
if I am wrong), they should still match under the new illuminant. It jas to
do with the spectral power distribution of each sample and the way it
physically intereact with the illuminant.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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