Delete the artwork from all (or just selected) tracks in the selected playlist.
Designated as a Retro Script because: iTunes multi-edit function can clear artwork from selected tracks.
(Note: In order to launch this PowerPC-era script on an Intel machine, it must first be opened and then saved using AppleScript Editor, which is located in your /Applications/Utilities/ folder. More information is here.)
OBLIGATORY WARNING! Because this script has been designated as a "Retro Script" there is no guarantee that it will function as described and may even corrupt or destroy data.