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# Blending Timewarped Frames

Blending frames allows you to create a fluid motion in timewarped clips. This is useful when you increase the speed of a clip. By blending frames, you are interpolating motion between frames, taking what may appear to be staggered movement, and creating an appearance of fluidity. You can mix frames together or create a trail effect that either precedes or follows the motion. You can also blend frames using an advanced motion estimation option.

When mixing frames, you are combining multiple frames together to create one blended frame using an additive mix. Each result frame is a blend of an equal number of frames from both sides of the given frame.

With Pre Trail and Post Trail blending, you have more control than in a simple mix. You can blend the frames before and after a given frame by different amounts. Do this to create a trail that comes before or after any motion in the clip. You can also set the amount of fall-off for the blend so that the trail fades away completely, partially, or not at all.

Motion estimation blends frames with subpixel accuracy, and is well-suited for particularly challenging timewarps. Motion estimation is good for processing slow-motion, constant, or variable speed timewarps of interlaced and progressive material. It is particularly good for material that introduces artefacts or for which you cannot get satisfactory results using Trail or Mix values.

#### Topics in this section

- Blending Frames Using Mix Values
- Blending Frames Using a Pretrail or Posttrail
- Blending Frames Using Motion Estimation