fliker boarders on keying

#1

y have a blue screen shot, the color blue is not perfect but with the diamond keyer works well, but the problem is that if the boarders are sharp you have a constant fliker moving, how is posible to resolve this problem?

#2

That sound like your footage is DV or something compressed?!
Anyway here is workaround:

  • apply a box blur and set it to 2 or 3
  • apply a “Compound HSV Arithmetic”
  • set the v operator to “set”
  • choose the original footage as v layer

now apply your keyer, matte controls, mask…

actually this setup blurs the chroma component which is undersampled in DV footage

#3

thanks but could you explain me a little better how to make the keying with out the flicker

so that happens because is a dv fotage?
thanks

#4

The best solution wolud be to shot on a better camera like BetaSP or HD …and tweak the lighting setup.

Anyway, I know that you often get DV Footage to key.

If your footage is really bad, this are my tips.

1.Try to pull the key from a copy of your layer and use that matte as mask for your original layer. With this method you could use every operator you like on the copy without affecting anything in your original.
use the “set matte” operator to apply that mask

2.to reduce the flicker effect apply a “remove grain” Operator before keying to reduce the noise in your footage which is actually producing that flickering.
If your footage looks too smooth after that do it in combination with tip 1.

  1. sometimes it helps to pull the key with 2 or more keyers by drawing an selection on different blue values

If that does not help you, the lighting setup of your footage is probably too dark or there was only one light on set.

#5

any other sugestion?

#6

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.