Good Morning, fellow flexers!
As you know, I spent my weekend, selling beer, for charity, at our local Pond
Hockey Tournament. (Photos to follow.)
It all started with a shot I took a shot of two of our volunteers, joking
around, as if they were drinking (the cans were sealed).
But something was very odd with this photo. Take a look.
http://www.furnfeather.net/Look/BeerSign.html
The tent, sky, snow, clothes, faces, etc. are all the right colours.
But the sign appears to be RED lettering on a YELLOW background - at least on
my monitor. (Your mileage may vary.)
So I took a little Olympus T-10 Point & Shoot ($49 when new.) and made some
comparison shots.
First up is the sign, by itself. To me, the sign looks correct , with BLACK
lettering on a flourescent ORANGE background.
http://www.furnfeather.net/Look/sign/Sign-1.html
However, when I backed up, to take the entire tent (as I'd done with the first,
troublesome shot), the camera exposed for the tent's interior. As with my
E-M1, all colours are correct, EXCEPT for the sign, which changes colours.
http://www.furnfeather.net/Look/sign/Sign-2.html
For a control, I shot the tent, with my E-M1, exposing only for the "Beer
Garden" sign.
http://www.furnfeather.net/Look/sign/Sign-3.html
and the colours are all accurate (if dark) including the sign.
But, when I exposed for the interior, the sign changes colour, again!
http://www.furnfeather.net/Look/sign/Sign-4.html
Now, exact colours may be slightly different, on different monitors (mine is
calibrated) but you should all be able to see the differences.
My question remains ... why?
I can only think that since flourescent paints re-emit UV light in the visible
range, to get that "glow", that when the frame is exposed for the shadows, the
sign becomes over-exposed, creating the colour shift. (It is IR, not UV that
most sensor have problems with.)
But, curiously, this does not appear to be the case with other flourescent
items, such as safety vests.
http://www.furnfeather.net/Look/sign/Sign-5.html
though I admit that this shot is not exposed for shadows. (Sorry, could not
find a better "control", yesterday.)
If anyone has a better idea, I'd love to hear it!
Thanks
David.
PS: Bill: Yes, the beer boxes are red and correct for Budweiser boxes. Neil:
your explanation may come closest to the truth. Thanks to all who looked and
responded to my first plea.
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