|Keyboard Shortcut||Menu Shortcut||Menu Location|
|T||Alt+R, U||Raster -> Trace Outline|
The Trace Outline command converts thick black lines and areas into thin lines, usually one pixel wide. This command only works on black-and-white images, and is usually the last step of image processing before running the Vector Convert command.
Specifies the maximum number of pixels to remove from either side of a thick line. For example, the default setting of 4 will reduce a 10-pixel-wide line to a 2-pixel-wide line.
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Check this box to see the results change as you adjust the Level setting.