I have a Raspberry Pi 4 4 Gb version thats running Lakka OS 3.3 for this subject. My default TV/monitor is a 1080p 16:19 aspect ratio. A few times I have connected it to a 4K TV.
I’ve tried images found in a variety of file sizes, colors and resolution sizes. What I don’t know is what exactly is the limit and what works really good.
In my experiences jpeg images behaved poorly and showed glowing pixels, which prompted me to converting some of them into a png format. Some of the complex artworks make it harder to read the text, though you can improve it by changing the font color and the font itself. Minimalist and simple backgrounds tend to work better for Lakka OS.
I’ve tried some images that are vertical and they seem to be kinda compressed down which makes them look a bit funny. I was messing around with a huge resolution of 5000 x 3268 and a file size of 14 Mb only for it to display black and not even appear in the image preview for selecting wallpapers, same thing happened with another image of 45000 x 3250 and a 6.2 Mb size.
I’ve seen some images that are really long horizontal resolution but a small vertical resolution which makes them pretty skinny images but I have not tested them out to see if they worked out fine. Another example of an image would be those that are even in size ie 1000 x 1000. If I do get around to it and test things out I will try to update this.
As for the Raspberry Pi 4 what resolution is the GUI set to? I’ve used some higher resolution images and they seem to be fine. What happens to a image that is a little too small is it stretched? How does Lakka OS interact with wallpapers?
This post is mostly for reference, since someone else would probably want to use their favorite images as a background. Some of the background images I’ve used are not wallpaper but I just use them as such anyway. Some fonts I’ve used that are bolder and bigger in size help the menu being more readable in some backgrounds, IE Coconutz,GilaBold.
Raspberry Pi 4 specs