run script on a picture

I am looking for a way to apply custom operation to selected image files 
(copy and resize then move to a hardcoded path, then apply some changes 
using jhead on the original file). How can I do that using gwenview ?

I see old versions of gwenview could call an external script but it does 
not seem to be available in the current gwenview version.

I see I could write a kipi plugin but it seems a bit overkill to install 
a system plugin just for some custom operations.

I currently use a custom eog plugin(in python), but I would like to try 
using gwenview.

Thank you for ideas :-)

Olivier

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