2017

Mismatched clips show F2 in their metadata.
When reversing the dominance of a clip, the first and last fields of the clip are dropped to account for the
offsetting required to reverse the field dominance. The resulting clip becomes a frame shorter. It is therefore
a good practice to always capture enough head and tail frames so that the fields dropped on both ends do
not adversely affect the visible frames.
Both the media and the scan mode metadata tag are changed by this process.
To reverse the dominance of clips:
1 Select Tools, and select the Clip tab.
2 Click Reverse Dominance.
3 Select the clip to process.
4 Select the destination.
The field dominance of the clip is reversed.
Deinterlacing and Interlacing
Deinterlacing and interlacing operations are used primarily to aid in the rotoscoping of field-based material,
or in the application of filters to field-based material. Deinterlacing and interlacing are not necessary for
processes that support field-based rendering.
Because there is a line-based difference in time per frame of interlaced video, artifacts may be introduced
when field-based frames are painted or filtered. For example, if a blur is applied over fields, colour information
from the pixels on Field 1 will be smudged into the pixels on Field 2.
Deinterlacing clips prior to applying any paint or filtering operations always provides better results. Once
the effects have been added, the clip can be interlaced again, if required.
To deinterlace and interlace clips, see the sections below. Clips can also be deinterlaced and interlaced using
ConnectFX. For more information, see
Deinterlace (page 1079) and Interlace (page 1118) in the Effects and Tools
Reference
(page 997) chapter.
Deinterlacing Clips
Deinterlace clips to separate each field to its own frame. The result clip is twice as long as the original.
To deinterlace clips:
1 Select Tools, and select the Clip tab.
2 Click DeInterlace.
3 If necessary, select Field 1 or Field 2 from the Field Dominance box. By default, Field Dominance is set
to Auto, which automatically determines whether the clip is Field 1 or 2 dominant. Manually set a
field if Auto does not work.
4 Enable or disable Interpolation based on the desired result:
■ If clips are deinterlaced with interpolation off, the process repeats each isolated line to fill in the
scan lines that would otherwise be vacant in the resulting clip's frames.
■ If clips are deinterlaced with interpolation on, the process interpolates a blend between adjacent
lines to fill in the isolated scan lines. This option reduces interlacing artifacts.
5 Select the clip to deinterlace.
6 Select the destination.
The result clip appears, now with double the duration.
182 | Chapter 6 Importing and Exporting Media