Tad
I think you will find that the .xar file size is not dependent on the use of a bitmap in a document, if it is used anywhere, as a fill or transparency etc, the entire bitmap is saved in the .xar file, even if the bitmap is completely invisible. This allows for re-editing which may reveal more of the bitmap.
Note that when you slice up a bitmap, vector path objects are created with bitmap fills.
The only real way to change a bitmap is in the bitmap effects gallery or to use the create bitmap dialogue.
To crop a bitmap I would recommend arrange->convert to editable shapes, adjust the path outline to the right shape (inserting curves if necessary) and then using the arrange->create bitmap copy.
Mark Goodall
Xara Ltd
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