The term "Extra Quality" is subjective in this context. Here is how quality is measured for system images:
xz -d system.img.xz
: The Phhusson Treble Wiki on GitHub is the primary directory for verified GSI builds. systemarm32aonlyimgxz extra quality
In the world of custom ROMs and Project Treble, this specific naming convention breaks down as follows: Refers to the system.img partition. The CPU architecture (older 32-bit processors). The term "Extra Quality" is subjective in this context