Toggle Between Polygonal Lasso and Lasso tool
Mac: Option + drag
Win: Alt + drag
Holding down the modifier while in one of these two tools will toggle you to the other. You must keep the modifier key held down while using the tool to keep the toggle active.
Add a Point
Delete the Last Point
Close the Selection
Both: Double-click or Enter
Close the Selection at the Starting Point
Mouse: Click on the starting point
Close the Selection Using a Straight-Line Segment
Mac: Option + double-click
Win: Alt + double-click
Cancel the Operation
Mac: Cmd + . (period)
Win: Ctrl + . (period)
Adjust Magnetic Lasso Width
Changes value in single pixel increments . Minimum value is 1 pixel; maximum value is 256 pixels.
Adjust Magnetic Lasso Edge Contrast
Changes value in 1% increments. Minimum value is 1%; maximum value is 100%.
Adjust Magnetic Lasso Frequency
Changes value in single unit increments. Minimum value is 1; maximum value is 256.