Keylight 2.0 chromakey issue...dancing pixels / noise in composited image

[Nicholas Natteau]

I can't figure out what I did wrong here:

http://vimeo.com/groups/af100/videos/29095983

I believe I lighted the scene correctly and this issue doesn't occur on the original footage, only after applying Keylight 2.0 does the problem arise: noise in the dark area of the comp, especially to the right of the talet, on the chair.

Does anyone know what I might be doing wrong in Keylight? The original footage is clean, but the Keylighted footage as noise in the dark areas.

 

[Superville]

hi nicholas,
under the effect controls, expand the Screen Matte option. look at the Replace Method drop down menu. try the different options. sometimes "hard colour" helps, or you might need to select "none." and then color correct the dark areas. see if any of those options help.

 

[Nicholas Natteau]

Hi Superville, thanks very much for that tip, will do. Actually someone else in another forum suggested that I simply duplicate the layer in Final Cut Pro, apply no keylight effect to the upper layer but instead select "Travel Matte Alpha" and that the noise would go away, and sure enough it did! Just thought you or anyone else encountering this problem might like to know. But thank you again for your help.