4.2

image sources (including alpha channels),
with a very high data rate to preserve the
detail in high-dynamic-range imagery
generated by today’s highest-quality digital
image sensors. Apple ProRes 4444 XQ
preserves dynamic ranges several times
greater than the dynamic range of Rec 709
imagery—even against the rigors of
extreme visual effects processing, in which
tone-scale blacks or highlights are
stretched significantly. Like standard
Apple ProRes 4444, this codec supports
up to 12 bits per image channel and up to
16 bits for the alpha channel.
Apple ProRes 4444 XQ features a target
data rate of approximately 500 Mbps for
4:4:4 sources at 1920 x 1080 and 29.97
fps.
Apple ProRes 4444: An extremely high-