Truncation

Removal of the least significant bits (LSBs) of a digital word – as could be necessary when connecting a 10-bit video source into 8-bit video equipment, or handling the 16-bit result of digital video mixing on an 8-bit system. Just dropping the lowest two bits is not the right answer. If not carefully handled truncation can lead to unpleasant artifacts on video signals – such as ‘contouring’. Quantel invented Dynamic Rounding as a way to handle the truncation of digital image data so that the values of the dropped lower bits are contained in the remaining bits.

See also: Dynamic Rounding