Obligatory warning: This script has been designated as an obsoleted "Retro Script". There is no guarantee that it will function as described with modern versions of iTunes and OS X. If used in its current form it may not work at all without modification and, at worst, it may corrupt or destroy data.
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.
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Create two playlists containing tracks with JPEG and PNG artwork
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View/Edit tags of selected track(s) in single window
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Locates pairs of track entries pointing to the same file
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Append user-entered text to beginning or ending of selected tag of each selected track