Creative Effects > Tracking and Stabilizing > Tracking Difficult Shots and Correcting Errors >
Finding the Best Tolerance Value

The Tolerance value determines how much discrimination the Stabilizer uses in matching the reference point from frame to frame and in setting a keyframe for that frame. At 100% tolerance (no discrimination), almost anything is considered as a match and a keyframe is set. At 0% tolerance (complete discrimination), only a perfect match is accepted.

If the reference point becomes hidden by another object, you can use the Tolerance value to make the tracker ignore the reference point in parts of the clip where it is hidden, then continue tracking it normally when it reappears. Choosing a good Tolerance value reduces the need to manually reposition the tracker box during analysis.

TipYou can also adjust the tolerance to make a desirable keyframe that has been filtered out reappear.

To find the best Tolerance value:

1. Click Setup and then enable Path to view the tracking path.
2. Analyse the clip with full (100%) tolerance.
3. Go to the first frame where the reference point is hidden by another object and adjust the tolerance value until the crosshair reappears in the tracker box.

   The crosshair reappears when there is a keyframe.

4. Go to the first frame in the sequence and click Analyse.

Once you determine the optimal tolerance value, further analysis automatically discards the undesirable keyframes, and the position of the reference point is extrapolated until the reference point reappears.