I'm working on chroma keying a four clips...using Boris RED within Vegas...Vegas 11 (reverted to it because 12 is not officially supported by RED yet).

I get jaggardy edges in the preview which I'm sure should not be there. If they're not really there and it is just an issue of resolurion of Vegas preview, it means I am getting a false view of what my keying is producing and thus I cannot be sure of how good my key is.

I have the preview set to the best resolution.

Does anyone have any thoughts on this?

Right click on the preview window, then uncheck the box for scale video to fit preview window. At the top choose Best Full. The preview window will now display 1:1 pixel for pixel cropped display of your preview.

Thanks Tom. The jaggardy edge was still there but I fiddled with the blur in 'Matte Choker' and could get it to go away. Lost something I wanted to keep so will have another go when I have more time...Appreciated...