Open files in the Tag Editor
In the Tag Editor, open one or more files that should be processed.
Show the Artwork Format column
To find and select the audio files having too big Artwork Format, show the Artwork Format column. This could be done both via main or context menu Columns / Artwork / Artwork Format.
How to show the Artwork Format column
Select cells and change the Artwork Format.
Select the Artwork Formats you need to change. Press the round button within the cell and select the Artwork Format - JPEG, PNG or BMP.
How to change the Artwork Format to JPEG.
When you finished, check the result of replacing the Artworks. Save the changes via ⌘+S or File / Save menu.
Artwork Format changed to JPEG.