- Load an Image
- The Levelwindow has 2 edit fields: the upper is the "level" the other is the "window". (btw: Some ToolTip would be nice to find out which is which)
- Type in "50" in the upper field and "0" in the lower field
--> The 0 will be autocorrected to 1
- Type in "0" again in the lower field
--> The 0 will be autocorrected again to 1, but also the "level" will be decremented to 49.