[PerfectHT]

@PerfectHT

1. Kodi compresses the images, need to use advancedsettings.xml to solve. Of course only for new images...

Create/edit advancedsettings.xml in Kodi userdata folder:
<advancedsettings>
    <imageres>9999</imageres>
    <fanartres>9999</fanartres>
</advancedsettings>

I created xml and put above four lines into it.  I went to settings reset picture to standard picture and then tried to insert new picture to test it, but I couldn't.  What I messed up?
I checked other RPi4 and also RPi3 and found up that no one allows me to change backgrounds anymore!  Only one RPi4 has advancedsettings.xml, so this is not source of my problem.  Any idea?