The region of definition action should do it for you. It will change the 
equivalent of the 'bbox' in Nuke. There is currently no way to change the 
'format'.

http://openfx.sourceforge.net/Documentation/1.2/ofxProgrammingReference.html#kOfxImageEffectActionGetRegionOfDefinition

b

On 19 Apr 2012, at 14:06, Steven Booth wrote:

> I confess, I’m not familiar with ‘OFX’ format, but if you need to output a 
> double-wide image, I would start by setting the format.width in _validate, 
> and then simply provide the extra pixels in each engine call.
>  
> Steve
>  
> From: nuke-dev-boun...@support.thefoundry.co.uk 
> [mailto:nuke-dev-boun...@support.thefoundry.co.uk] On Behalf Of Víctor M. 
> Feliz (MOTIVA)
> Sent: Thursday, April 19, 2012 2:56 AM
> To: nuke-dev
> Subject: [Nuke-dev] Change output clip size (ofx)
>  
> It should be a trivial question but I didn't get the solution.
> 
> I've been developing effect plugins in OFX format for a while I'm getting the 
> image bounds correctly for the output and so, all works fine... but what if I 
> need to create a double width output instead the same size of the input?
> 
> I've been looking on the html document, in the examples and so but without 
> luck.
> 
> Best regards, Víctor.
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