or selecting from Menu Edit - Edit Layer when you selected a layer.
You may Load an image to the layer with Load button.
You may crop a visible layer image area by dragging cropping frame over the image. The
cropping frame can have free or fixed aspect ratio. Use drop down combo box to change it.
Max button will expand cropping frame to maximum possible area regarding current aspect
ratio of the frame.
Revert button will reverts changed cropping frame into it's original location.
You need to press Apply button to accept the changes.
