Glossary - Autodesk 64006-051108-9001 - Discreet Cleaner - Mac User Manual

Glossary

Glossary
2.21:1 Aspect Ratio — see Cinemascope.
3:2 Pulldown — a conversion of film frame rate material (24 fps) to NTSC video (29.97 fps), that
results in the addition of approximately 6 frames per second. Pulldown frames are created by
blending frames from the original source in a specific pattern and are very undesirable in
compressed movies. Pulldown is introduced with a system called Telecine and can be removed
with Cleaner Intelecine feature.
4:1:1 Color — uses chroma blocks 4 wide x 1 tall. Moderately compressed video color
subsampling in which the luminance channel is not subsampled, but the chrominance channel
has 1/4 the resolution. Most of the DV formats use 4:1:1 color.
4:2:0 Color — uses chroma blocks 2 wide x 2 tall. Moderately compressed video color
subsampling that is very similar to 4:1:1. Standard color for MPEG.
4:2:2 Color — uses chroma blocks 2 wide x 1 tall. Mildly compressed video color subsampling
in which the luminance channel is not subsampled, but the chrominance channel has half the
resolution. Commonly used in professional digital video formats, such as Digital Betacam, D1,
D5, D9, DVCPro-50 and Motion JPEG. While Betacam SP is often described as being 4:2:2, it is
an analog format, and doesn't have a digital colorspace.
4:3 Aspect Ratio — common width-to-height display aspect ratio. 640x480 and 320x240 are
examples of 4:3 aspect frame size.