Message
Re: [colorvision_group] Re: Prob profiling IJA MicroCeramic Luster (long, for ColorVision tech guys)
2007-11-20 by CDTobie@aol.com
In a message dated 11/20/07 1:12:48 PM, dealy663@... writes:
I'll clean the tile and re-measure. Have you heard of this type of
problem with the IJA Micro Ceramic luster before? I've measured many
other RC papers like this and not seen the spectro freak out in such a
disastrous way.
Papers with huge amounts of artificial brighteners can be tough to process. Staying away from such papers is a good idea in the first place, but the only thing we can do if your spectro reads that paper white as bright cyan, is replace your unit with one that can handle it better...
Also why does the weirdness really only seem to come out when I add
the gray measurements?
Problems that occur when adding the grays usually are caused by differences between the color and gray target. Different amount of drydown, different media setting, or perhaps from your description different spectro response to white, if in one case more whitened paper is under it, and in the other a dark sheet is under it. This is a yes/no situation. Does paper white read with a high negative b* value or not. If yes, nothing else matters. If no, then its a different problem.
C. David Tobie
Product Technology Manager
Digital Imaging & Home Theater
Datacolor Inc.
CDTobie@...
www.datacolor.com/spyder3
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