A range of lossy, video compression systems developed by Apple Inc. Designed for editing it is described as ‘intermediate’, between uncompressed and more highly compress delivery quality. ProRes 422 can work with formats from SD to 5K using 10-bit, I-frame only, variable bit rate coding. For HD 60i there are three qualities; Normal 147 Mb/s, High-Quality 220 Mb/s and ProRes (LT) 100Mbit/s. There is also ProRes Proxy at 36 Mb/s for offline. For SD there are Normal 42 Mb/s and High-Quality 63 Mbit/s.

ProRes 4444 adds support for a 16-bit alpha (key) channel, and video sampling up to 12-bit.

See also: Quick Time