OS X 10.8 or later. This script will assemble two playlists populated with Music library tracks that contain, respectively, JPEG artwork and PNG artwork.
Perhaps Also of Interest...
downloaded 18m 48s ago
Enter text for the selected tracks' Category tag
downloaded 43m 1s ago
Perform tasks on a batch of playlists; rename, delete, duplicate, merge, more
downloaded 1h 6m 28s ago
Drag-and-drop to convert audio files with iTunes
downloaded 1h 50m 43s ago
Displays files in iTunes Media folder not in iTunes track library
downloaded 1h 50m 57s ago
Convert selected tracks and export the converted files to a new folder
downloaded 2h 23m 48s ago
Remove iTunes tracks disassociated from files