Bezier Help Wanted - Sky Replacement

[willbrownltd]

Hi,
I have only been using Nuke for a few weeks, so any help would be greatly appreciated.
I am trying to remove the normal blue and white sky, and replace it with a red sky on 190 frames.
I am using the Bezier tool but I cannot find the right merge settings (mask, overlay, add).
Please can someone advise which setting I have to use?

Please look here for a screen shot and a clearer picture:
http://i150.photobucket.com/albums/s91/melonrecords/nuke3.jpg


Thank you in advance,
Will.
www.willbrownltd.co.uk

[Antoine]

Hi Will,

There's a few different ways to set this simple composite up.
One of the most academic to me would be to invert your bezier, write it only in the alpha channel,
(tick the invert box, untick the red, green and blue box)
then add a "premult" node under your bezier,
and finally switch your merge node to "over".

Hope this helps ...

Antoine

[willbrownltd]

Thanks Antoine,
This has worked but my bezier'ing skills are not great yet!

Thanks again.
Will.