The Image Tab
65
Eliminate Top, Bottom Field
— removes every other line of the original source and interpolates
extra lines if needed. Selecting either option generally produces sharp images because it
eliminates the motion blur effect of interlacing and produces similar final results.
Intelecine
— Intelecine is the exclusive Cleaner “intelligent” inverse telecine 3:2 pulldown
removal option that removes the extra pulldown frames added to movies when they are
transferred from 24 fps film to 29.97 fps NTSC video. Unlike other forms of inverse telecine, the
Cleaner Intelecine feature can detect and automatically adjust to edits in the video.
Auto
— Automatically determines the best de-interlacing method for the video.
To quickly check if your source file contains 3:2 pulldown frames, find a sequence without any
edits and step through it frame by frame. You should see a repeating pattern of three
progressive frames followed by two interlaced frames.
Note:
If you use the Top or Bottom de-interlacing options and get a slight stutter in the video,
you may be seeing frame duplication resulting from source material that was shot on film and
transferred to video. In these cases, capture the source video at full-frame size and rate and use
the Intelecine option. See the next section for more details.
Processing NTSC Movies Shot on Film
The frame rate of film is 24 fps; the frame rate of NTSC video is 29.97 fps. When movies are
translated between film and NTSC video, extra frames are added to compensate for this
difference. These new frames are created by a machine called a telecine, and the process is often
referred to as introducing a 3:2 pulldown into the material.
There are four important reasons to return your material to its original frame rate before
encoding it:
•
Leaving the pulldown frames in your material looks bad. These extra frames have strong
interlace lines in areas of rapid movement. This effect is similar to normal interlacing,
except it is more pronounced and displays poorly on a computer screen.
•
Blended frames encode poorly because of the strong interlacing artifacts present in them.
•
Extra frames do not have unique information in them. They are simply blends of two other
frames in the source. These frames are important for NTSC television, which requires 29.97
fps, but are totally useless for desktop video, which does not have this constraint.
•
A frame rate of 24 fps is 20% less frames (and therefore less data) than a frame rate of 29.97
fps. Encoding the original 24 fps source produces smaller/higher quality files.
Содержание 64006-051108-9001 - Discreet Cleaner - Mac
Страница 1: ...from discreet November 2000 ...
Страница 8: ...Contents viii ...
Страница 16: ...Chapter 1 Introduction 8 ...
Страница 24: ...Chapter 2 Capture 16 ...
Страница 54: ...Chapter 4 Projects 46 ...
Страница 68: ...Chapter 5 Settings 60 ...
Страница 148: ...Chapter 7 Formats 140 ...
Страница 160: ...Chapter 8 Encoding 152 ...
Страница 220: ...Chapter 8 Encoding 212 ...
Страница 248: ...Chapter 11 Workflow 240 ...
Страница 254: ...Chapter 12 Troubleshooting 246 ...
Страница 284: ...Glossary 276 ...