John Francis wrote:
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(I used to use that trick a lot.)
> One one costume, though, I noticed an extreme colour shift. It
> was made of blue velvet material (about the colour of Sexy Kitty
> for those who watched the most recent episode of CSI). But on
> the captured image the material comes out bright purple!
First, Google for "anomalous reflectance". I've read about
the effect on film before, and apparently there are certain
fabric/dye combinations that are a real PITA for catalog
photography because of it. (Or maybe you don't have to, since
you already have a handle on the cause. But I found it
interesting reading the last time I dove into the subject.)
Second, I've seen this in a (very cheap) digital camera a few
years ago, but only with flash shots. Purple eggplant on
the vine came out looking like shiny blue latex balloons!
In that case it was a strange glitch in the white-balance
software, which I thought was a bit odd since it only showed
up with the flash.
-- Glenn
