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color phasing problem – fix? …desperate… (also about this problem)
I recently shot some “man on the street” style interviews at the San Diego Convention Center. About half-way through the filming I noticed that, when I was inside the large tradeshow area, the camera (Sony HVR-Z1U) was picking up some phasing (best word I could think of) with the lighting/color. First the shot would be warm and red and then it would go to a cold blue tone. The change didn’t seam obvious to my eyes but was easily picked up on the camera and it happened on a predictable pace.
What I tried:
Manually adjusting settings on the camera
Auto Adjusting settings on the camera
both of the above while using my teeny-tiny camera-mount spotlight
What I’d LOVE some one to tell me…
Why did that happen???
What can I do now??? I need to use the footage and it’s a time-sensitive issue…Here’s a copy of the problem you can download and see what I’m talking about:
https://68.178.228.241/media/junkclip/01.movI fall at the mercy of “Cow-toria’s” collective wisdom….
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4 Replies
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Looks like color phasing through a cycle due to the lighting (fluorescent?). Auto white balance will do that to you.
Some cameras will pick that up, even the very expensive ones.
How can you fix it ?
Not easily. I would approach the issue using a vectorscope and identify the beginning and end of the cycle. You can then keyframe some color correction and change the hue accordingly.
In the end, it’s not like the shot was lit to begin with, so you may be able to get away with it without a correction. The question is, will the client notice ?
Vince Becquiot
Director | EditorKaptis Studios
San Francisco – Bay Area -
Victor, thanks for the thoughts!
Yeah, the client (the internal Communications Dept) noticed… I tried to slip it by… lol
I was doing the key framing thing and got annoyed (7mins of footage) so I posted…
I’m using premiere CS3 – I didn’t see a v-scope, (I might be too novice on the terms here) but there’s few color adjustments I’ve been messing with.
In the future, if we’d have set up a spot near our booth and used our own lighting, do you think that would over-ride the big gymnasium style florescents?
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I think it may go away with a set white balance (were you set to auto white on the camera?).
Not sure if a spot would do it. You would probably have to tent the whole thing over or have a really bright spot. I would go outhere before the shoot and do a few tests.
Vince Becquiot
Director | EditorKaptis Studios
San Francisco – Bay Area -
I tried both ways with the white balance – one where I set the white (even though it’s not a completely manual setting, it’s a “point at something white and press this button” adjustment) and one where i let the camera manage the white…
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