Change Blender Render Save Default to RGB from RGBA Is there a way to change the default for saving a render to RGB instead of RGBA? This saves me disk space when working with renders that don't have an alpha-channel anyways.
I can't find anything on it under Edit &gt; Preferences
You need to save your preferences as a startup blend-file.

Create new default blend-file
Change the image format settings in Output Properties &gt; Output
Save the blend-file
State the blend-file as the default startup blend-file Info Editor &gt; File&gt; Defaults &gt; Save Startup File

Make sure you're in the saved blend-file when you state the blend as the startup default!
Note: I'm not sure if this overwrites previously saved blend-file defaults.
Unfortunately I think not. But it should for all future saved blends.