That is as expected. It doesnt apply a reformat, but sets the working area, so 
as your rotos were done at 1280, then they will work from 0,0 to 1280,720(?)

You can add a reformat after or select all rotos, go to transform tab and set 
origin to 0,0 and scale by 1920/720. 

When there is a bg input this overrides the format option. 


Howard

On 3 Sep 2012, at 14:25, Johannes Hezer <[email protected]> wrote:

> Hi List,
> 
> I hope this is an easy one, I cant figure out how to tell Nuke that my Rotos 
> should scale according to the format coming in ?
> 
> We had a shot done in 1280 and now switched to 1920...
> All Rotos stay in the 1280 area of the image left lower corner instead of 
> scaling proportionally ?!
> 
> Is that normal ?
> I know that I have to touch all Blurs and Feathers by hand anyway, but how 
> can I "scale" my rotos ?
> 
> There are some rotos I can "reformat" (with a reformat node )but some are in 
> the flow and cant be "reformatted"...
> 
> Changing the format in the roto node does not do anything when there is a bg 
> in the Roto already ?!
> 
> Cheers
> j
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