I have a rendered image in compositing with a node set up to add a vignette. It all looks good in the compositing window but I cannot find a method to save this new image.
There are two ways to save it.
The first way is to predefine the output in the properties panel under render>output. You can set a destination and file type there. Once you click render the image will automatically save there.
The second way is to render the image with the vignette, and then select Image>Save Image As at the bottom of the render panel.