Add some way to crop letter/pillar boxes more precisely. Cropping black bars manually appears easy, however, as the preview window is usually downscaled, can not be done pixel accurate visually.

Add a button to activate automatic black bar detection, and set cropping parameters accordingly? 'Semiautomatic' - just as a one-time search-and-set function. This may need to detect an average black level, as not all sources have digital zero for black. Also, some codecs create smeared edges between letterbox and signal - one should probably include these into the active pixel area. The automatic detection should also enable the red image boundary immediately. Don't make it too complicated. Just a click, and then ideally, the red frame should turn up, and the cropping should be set. One can always readjust, or redo it.

Do we need a 'Reset' cropping somewhere? Sometimes I miss this after having tried 'Scale to fit width/height'...
Should this also reset scaling to automatic detection (guess from content)?

• Carsten