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How to eliminate flicker / bluish glow
Flicker: After I imported my Canon XF105 .MXF video files into PPro CS6, I noticed there was a slow-moving flicker from bottom to top (sort of like the flicker you get sometimes when you film a computer screen). It is barely noticeable, but it is there. My file is Upper Field First interlaced, but I am editing in 720p in case it is relevant. Can I eliminate or at least reduce that?
Glow: Since I used a strong backlight on my subject, his white hat is almost overexposed and has a bluish outline. Is there anyway to eliminate / color-correct / reduce that in PPro?
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4 Replies
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720p is progressive for one thing, how is it that you are working in a Interlaced sequence? Are you combining formats?
Have you viewed your video on a external video monitor? You can’t judge it on a computer screen.
Chris
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Hello Chris, and thanks for replying.
Ok, here’s my case: When I import my .MXF clips to a matching sequence, the sequence setting shows a 1920×1080 and “Upper Field First” under settings, which means it is interlaced, not progressive (as far as I could gather).
The point at which my life becomes complicated is when I need to scale (enlarge) some of the scenes from my clips. If I do that in 1920×1080, I lose quality because I’m enlarging it more than 100%. The only reason I want to go for 720p is because it allows me to enlarge some of the frames without losing a lot of resolution. According to some of the expert advice here, I should stick to interlaced, not jump to progressive, since it matches my clip settings.. So 720p is a bad idea. But how can I enlarge some scenes without losing quality in an interlaced 1920×1080?
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What you are doing is not UN-common, we often shoot 1080 and edit in a 720 sequence. This allows room to move, cut in, etc. Works great.
But, you need to shoot progressive in 1080, like 1080/30p or 1080/24p
and then edit in 720/30p or 720/24p.So why not res up the problem shots a couple of pixels and eliminate the issue?
Chris
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I hear you. I should shoot in 1080p next time. Anyway, the reason I can’t work in 1080i now is because I am scaling some frames up to 125%, or even 150% in some instances. If I do that in 1080i, the scene becomes pixelated, which is why I chose to work with 720p. I didn’t notice any interlacing though, which is weird. Shouldn’t importing a 1080i video into a 720p create that problem?
All this aside though, I noticed that the aforementioned flickering is present even in the 1080i sequence, which is also weird. I’m guessing it is because of the strong fluorescent back light (maybe it’s a frequency thing). I tried all sorts of things like trying different things with the field options, to no avail.
By the way, did you ask about whether I checked the scene on an external video monitor in order to see whether the flickering was present, or whether the bluish glow was still showing?
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