The command automatically
crops the active layer, unlike the
Crop Tool, or the
Crop Layer command which let you
manually define the area to be cropped.
This command removes the largest possible area around the outside edge
which all has the same color. It does this by scanning the layer along a
horizontal line and a vertical line and cropping the layer as soon as it
encounters a different color, whatever its transparency.
You can use this command to crop the layer to the dimensions of a subject
that is lost in a solid background which is too large.
Activating the Command