So I’m photographing Misty’s Big Adventure during their incongruous yet still thoroughly enjoyable set on the BRMB stage at Artsfest and, since I have a press pass, I’m right at the front in the photographers pit giving it all that with the lens. Since gig photography is a very predictable art (unless you’re a genius of course) I’m always looking for new tricks. Misty’s were performing during the early evening so the light was pretty good and the spotlights were spinning around all over the place so I went for a bit of lens flare. On the leetle LCD display this one looked like a keeper but looking at it on the computer screen something was wrong.
Zooming in the culprit became clear.
Double Triple Ewww!
It seems to me that the light hit the camera sensor in such a way that it bounced back, hit the rear of the moiré filter and re-registered. Or something. (Is the moiré filter a physical thing or an algorithm?) Whatever it’s dead irritating and not something I can happily pass off as a fortuitous accident. It’s just kinda ugly. And while I don’t want to get into a tedious film-vs-digital argument I’m guessing if this happened with film it would certainly be fortuitous.
Still, it’s kinda interesting.
That’s a bugger! Moiré filters can be both types – physical, and algorithms built into post-CCD processing – depending on your camera. But since a RAW file allegedly contains all the info the CCD captured then you’re like to have more control with trying to post-process the image.
This might help to some extent
http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00InvF
This pattern almost looks *too* regular for moiré alone – d’you reckon there’s some sense that the CCD is getting saturated in one of the RGB planes as well? Simple noise filtering won’t shift the ugly chromatic shifts.
Once again, bugger.
Thinking about it, I wonder if the CCD just got temporarily burnt out by the spotlight and is over compensating on the face?
Certainly looks like it. DSLR software is quite robust but you can never rule out a temporary processing glitch that resets on restart. I took some pics last year that showed a remarkably wrong colour cast, though the effect was pleasing. All fixed after switching off the camera.
Before camera reset
http://picasaweb.google.co.uk/docdelete/Blog/photo#5111567455014740498
and after
http://picasaweb.google.co.uk/docdelete/Blog/photo#5111567472194609698