I have the node setup shown below.
The input image size is 8000px by 4000px. The scale node is supposedly reducing this to 800px by 600px.
If I hit render, and then manually save the output from the UV Image editor, I get exactly what I would expect (a nicely scaled image size 800px by 600px).
However, if I go to look at the file generated by the file output node, I get a different result. I get an image of size 8000px by 4000px with my 800px by 600px shrunk image in the centre of a massive black border.
How can I make the file output node output a properly scaled image?