What is field dominance, Using reverse telecine on a single source clip – Apple Cinema Tools 3 User Manual
Page 115
Chapter 6
Preparing the Source Clips for Editing
115
Using Reverse Telecine on a Single Source Clip
Use single-clip reverse telecine to perform reverse telecine on one clip.
Note: In most cases, you need window burn to use the Reverse Telecine feature
because you need to examine the key numbers or timecode in the clip itself to make
reverse telecine settings. However, if your source clips originated from a certain type of
camcorder that shoots 24P, such as the Panasonic AG-DVX100 camcorder, you do not
need window burn in order to reverse the pull-down. See “
” on page 190 for specific information.
To use the single-clip Reverse Telecine feature on a clip:
1
Choose File > Open Clip, then select the clip in the dialog.
2
In the Clip window, position the playhead so that a still frame with clearly readable
window burn is displayed.
You need to see the window burn in order to identify the frame’s frame type for the
Reverse Telecine dialog. Often the first frame will do, but any frame in the clip can be
displayed. (Reverse telecine will be applied to the entire clip, regardless of which frame
is displayed.)
3
In the Clip window, Click Rev Telecine.
4
In the dialog that appears:
What Is Field Dominance?
The field dominance of a captured clip is determined by the telecine hardware, and is
usually not configurable by the user. Video frames are composed of two fields; one
field consists of all the even lines of the video, and the other field consists of all the
odd lines. At the telecine, two fields are scanned at different times, which means that
the film frame can advance between the time that the first field is scanned and the
time that the second field is scanned:
 When only one field is captured, field 1 dominance means that only field 1 is
captured, and field 2 dominance means that only field 2 is captured.
 When both fields are captured, field 1 dominance means that each captured frame is
digitized from two video fields, but field 1 occurs earlier.
Note: With field 1 dominance, the two video fields digitized into each captured frame
should have the same timecode address, because SMPTE timecode is specified as
beginning on field 1. Field 2 dominance, when both fields are captured, means that
field 2 occurs earlier, and that the captured frame contains video fields with two
different timecodes.
UP01101.Book Page 115 Thursday, March 10, 2005 3:16 PM