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fix flourescent bulb (sychro scan) flashing issue
in Malaysia, my shooter and i were confronted with a room which was lit with particularly garish flourescent light bulbs, and there was a presentation going on where the audience footage was more important than the speaker.
because of this, and the fact that there was no time to light the whole room, we had to shoot with the bad light in there. we could see in the viewfinder of the HVX200 that there was a ‘flourescent flash’ whereby each frame doesn’t have consistent lighting to the next.
of course, your eye compensates for it in real life, and it just looks like dim light, but when recorded to video, you can really see the bad effect of the flashing light.
i’ve seen this before, but never this bad, and i was always able to fix it with synchro scan.in malaysia, we messed with framerates, and the syncho scan settings, which minimized the look, but coming back to the states now, and seeing it in FCP, i realize that it is a bad look, and wouldn’t want the client to see the footage unless it is somehow fixed.
now this isn’t TOTALLY a do-or-die kind of thing. we’ve got some other footage of similar stuff at another location, but i’d REALLY like to use this, and if i can spend a couple hours fixing it, i’d love to do just that.
so my question is: can this be fixed at all?
it seems like some sort of frame blending, or filter whereby the lighting conditions from frame to frame would be matched up could give it an acceptable look. but i don’t know what that filter or effect might be.any advice?
thanks in advance for your help.
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1 Reply
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Can’t really tell form your description if this will help but After Effects has a simple color filter operation, something like color correction, but it will fairly accurately hold a white balance through various lighting conditions.
I have used it many times at our shop (but I’m not at my AE machine right now, can’t tell you what the filter is really called). We often shoot under mixed lighting conditions at our large facilities. Daylight and fluorescents get mixed with pressurized vapor lighting systems that pulse at a slightly different rate than the mains of 60 Htz. The result is a ramping color change in the video and a change in f-stop that manifests as a perceptible change in depth of field. After Effects can take care fo the color shifts but we’ve learned to be very careful on exposure settings at these facilities.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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