Feature request: Offline compositing/denoising

[BeheadedKamikaze]

Add an option to render the passes direct to OpenEXR and skip compositing. In a separate step, load the OpenEXR and perform denoising and other compositing.

This will allow people with heavy scenes or low RAM to work around having failed (black) passes due to out-of-memory conditions.

Step 1/Mode 1: Render

Should disable the Compositor, and set the Output Format to Multi-Layer OpenEXR. This will automatically save every render layer to the output image. It will also work if they choose Render Animation.

Maybe a button to restore the user's selected Output Format and re-enable the Compositor if they want to turn it off.

Step 2/Mode 2: Denoising/Compositing

Should either import the image, or connect up a selected Image compositor node to the Super Image Denoiser (or add one), ready for compositing and denoising when the user renders.

Could use an Image Sequence if they rendered an animation.

[DrachenSeele]

This is already a feature in blender itself and has already been implemented in the beta branch.