When an action is started from the UI, not the batch processor, it is possible to manipulate a selected artwork item. This is only possible if the following conditions are met:
You can test if the conditions are satisfied via the \sa escape sequence. If the numeric value returned is 0 or false, the conditions have not been met. The \sa sequence can be inserted from a context menu's Insert Yate Escape Sequence > Miscellaneous > Selected Artwork Indicator menu item.
The following four artwork action statements support the specification or testing of an index.
Artwork to Folder
Crop Artwork
Indexed Artwork
Manipulate Artwork
When the index is specified as \sa, the selected artwork item will be used for files which contain the item.
The \sa sequence allows you to create an action which operates on a single artwork item selected in the UI.