Question

What does the level clipping filter do?

Answer

Level clipping is a technique that maps nearly white pixels to be absolute white and nearly black pixels to be absolute black.

By default, white pixels have a value of 255 and black pixels have a value of 0. The white and black input level sliders map the white point and black point.

• When the white level is set to a value below 255, all pixel values above that level are mapped to absolute white (255).
• When the black level is set to a value above 0, all pixel values below that level are mapped to absolute black (0).

This filter is typically used to force the nearly white background of an image to be absolute white.

Note
As of uScope Navigator v4.3, the white level can be configured to clip to the selected pixel value rather than absolute white. This yields more pleasing images.