October 18, 2026

The mac mini -- backgrounds and images

I copy a favorite background image to the Mac. This is avra4_bg.jpg and is 3840x2160 pixels.

I have learned about Apple pixel doubling. I have a 27 inch 4k display (3840x2160). Apple treats it as a 2560x1440 pixel workspace.

I am advised though to give it background images as 3840x2160, otherwise it wil downconvert then to 2560 wide, then back up to 3840 for display, making them blurry.

Set my background

I go to Finder, locate my image, right click, then at the bottom I see "Set Desktop Picture". This works nicely.

After doing this, I use the command line to create a Backgrounds directory and I move the image into it. Will this confuse MacOS? It does not seem to. I log out and back in without a problem.

Have any comments? Questions? Drop me a line!