DV NTSC is always lower field first, while HD 1080i is upper field first. To remove field interlacing, you must first determine the field order. The video scaled 200% to accentuate the issue. The right portion of the image has those tell-tale “comb teeth”. However, have you ever tried to key interlaced footage? It can be done, but it’s a mess. This is a huge benefit of working with progressively shot footage – you don’t lose half your resolution when you remove field interlacing. Some people may argue that you’re removing half of the resolution of footage by removing fields, and this is, in fact, true. Yes, you can key interlaced fields, but if you’re shooting vertically and plan to rotate or scale interlaced footage, you’re inviting a mess of problems.
If you have to work with footage with fields, you will need to remove field interlacing before keying. Luckily, I don’t deal with field issues much these days since I mainly work with progressively shot footage. These steps will hopefully improve your footage enough that you can end up with a good quality key in the end, and speed up your workflow and your render times.
Not all steps are necessary and it will depend on the problems in your footage. See part 1 in this series: In Depth: Keying: Introduction & Frequently Asked Questions about Shooting Greenscreen Pre-processing Greenscreen Footage (AKA Fixing problems before you key)Īs tempting as it is to just start applying keys when you have your green screen footage in your NLE, there are some things that you may need to do to prepare footage with problems for the process. You’re used to sitting behind a computer and you’re suddenly thrown into a studio. I know, a lot of video editors and motion graphics artists are now expected to do it all. You’ll learn how to do it right with experience. No? You shot it and you just don’t know what you’re doing because you’re an editor, not a D.P. Oh wait! Your footage is not perfect? You’ve gotten footage shot by someone else. You have saved gobs of time and stress because you shoot it properly. because your actor is standing at the right distance from your greenscreen. Imagine this scenario: You light your greenscreen just right.
Change your Pixel Aspect Ratio before Keying.Pre-processing Greenscreen Footage (AKA Fixing problems before you key).
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