I get a different resulting image for each of these three situations:
- I edit the true Render Result directly with "Render Layers" node in the compositor. (The Render Result image was never saved externally.)
- I save the Render Result as a PNG file, and then edit the externally-saved image with an Image node in the compositor.
- I save the Render Result as a PNG file, open the image with an Image node in the compositor, and connect the Image node to the Composite node. The external image is now loaded into "Render Result" (kind of like a pseudo render). I then edit "Render Result" with the "Render Layers" node in the compositor.
The second two situations gives me different results from the first.
What I want is the first result, but then I need to re-render if I accidentally close Blender during the process or want to make additional changes with the compositor in the future (since the "true" render is deleted upon closing Blender, and all I can save is the PNG).
Is the saved PNG missing some kind of information that the "true" Render Result image has? How can I remedy this?
(Note that I tested this by using a "Glare" node. This node seemed to have no actual glare effect for situation #2... it only darkened/lightened the whole image. It had a sparkly/glowy effect for situations #1 and #3, but they were very different.)
(I'm new to Blender.)