Just tried and it works.
image://albumart/album=Blur:%20The%20Best%20Of&artist=Blur image://albumart/album=Blur:+The+Best+Of&artist=Blur image://albumart/album=Blur: The Best Of&artist=Blur
All return the same result.
Just tried and it works.
image:/ /albumart/ album=Blur: %20The% 20Best% 20Of&artist= Blur /albumart/ album=Blur: +The+Best+ Of&artist= Blur /albumart/ album=Blur: The Best Of&artist=Blur
image:/
image:/
All return the same result.