When using either the magnetic Lasso or the Magnetic Pen, the following shortcuts can help to quickly change tool options:

[ or ] decreases/increases the lasso width
[ or ] + Shift goes to the minimum/maximum lasso width
',' (comma) or '.' (period) decreases/increases the edge contrast
',' (comma) or '.' (period) + Shift goes to the minimum/maximum edge contrast
';' (semicolon) or ''' (apostrophe) decreases/increases the frequency
';' (semicolon) or ''' (apostrophe) + Shift goes to the minimum/maximum frequency

Posted by Julieanne Kost at 6:33 AM | Permalink

While using the Lasso tool, tapping the return/enter key will automatically highlight the Feather amount in the Options bar. This feather is applied to the NEXT selection that you draw with the Lasso tool.

Posted by Julieanne Kost at 6:31 AM | Permalink

Holding the Option (Mac) / Alt (Win) key while dragging the Lasso tool will toggle to the Polygonal Lasso tool and vice versa. When starting with the Lasso tool, this previous shortcut might take a few tries to master as you have to be careful to release the Option key (to return from the Polygonal Lasso tool to the regular Lasso) while holding the mouse down.
In addition, holding the Option (Mac) / Alt (Win) key while dragging the Magnetic Lasso will toggle to the regular Lasso if you drag with the cursor and the Polygonal Lasso if you click with the cursor.

Posted by Julieanne Kost at 6:28 AM | Permalink