I figured I’d make a separate thread for this question as it’s technically a different issue with other beneficial use cases, even if it’s partly a continuation of this discussion. I’d like to know if Blender allows resizing an output image beyond the scale of the render, in order to add custom render passes into the same output.
For example: I’m making a render at 1920 x 1080 resolution. When saving the final image, I want the image file to be 3840 x 1080 instead. On the left side I have a normal version of the render… on the right side I can add different pass, like alpha or depth or normal, which a custom player can use for special effects.
The issue is that as far as I’m aware, the output image is forced to have the same dimensions as the size of the render, I don’t see any option to resize the output from the compositor or post-render. This is only ever done for multi-view when choosing side-by-side stereoscopic rendering, which is not customizable to my knowledge. If that can be bypassed, sorting the passes from the compositor would be a piece of cake.
Also please don’t suggest ImageMagick as it’s been brought up in other places: I only use Blender to render and ffmpeg to compile to an animation. If Blender can’t do this I’ll try it from ffmpeg or find another way.