Example: Painting on Fields

You can isolate the upper or lower fields in an interlaced clip and paint directly on those fields (without having to separate the fields through a rendering process).

In the following example, the green circle is interlaced, resulting in a very torn image (as often results with rapidly moving objects in a clip).

Due to the interlacing, the circle is in a different position on every other line of the frame. To paint a blue dot in the center of the circle, for example, the clip needs to be deinterlaced.

With the Deinterlace operator, the clip is converted from fields to frames, and each field is duplicated to create an entire circle. (Usually, you select the Fields to Frames convert option when you want to paint on the fields.) Next, a Paint operator is applied, and the blue circle is painted on each deinterlaced frame.

When painting on a deinterlaced clip, you are only painting on the upper or lower field of the image (the duplicate fields are not saved).

Note: Deinterlacing doubles the length of a clip, so you need to paint on two frames for each original frame. To minimize your work, only paint on deinterlaced frames when necessary.

When the clip is interlaced (for final output), the blue dot appears correctly.