ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

Re: Green Screen Dancing Edge Pixels (After Effects CS6)

COW Forums : Adobe After Effects

Respond to this post   •   Return to posts index   •   Read entire thread

Mark Whitney
Re: Green Screen Dancing Edge Pixels (After Effects CS6)
on Mar 22, 2018 at 9:00:19 pm

[Matt Dodds] ""If you zoom in on your footage to this level and step through it frame by frame (no key or effects) you can see the edge of the hairline boiling and little areas of distortion going on where chunks of hair literally move over 16 pixels for a few frames and then move back or sections get averaged to keep the bandwidth. This may be function of the camera or the codec, I'm not sure, but this is also going on at the edge of the hair so you are keying a moving target. It's almost has a shower glass effect."

Is there a way to alleviate this problem, if any?"

Quite simple: As we've mentioned, just get a bit better exposure on your subject (add some backlight) and more uniform process screen exposure. From the sample you posted, it uses a chroma subsampling of 4:2:0. Common, looks fine in most cases, but doesn't leave much wiggle room when doing keying work.

To fix this shot: No quick/easy fix really. Least painful is to reshoot if possible after you get your set-up dialed in and those ARE easy fixes.

Posts IndexRead Thread 

Current Message Thread:

© 2019 All Rights Reserved