button also toggles this control on and off.Before tracking, use the Tracker’s properties panel and Viewer tools to control Viewer output and determine tracking behavior.
| 1. | Click the Settings tab to display the General controls. |
| 2. | Select the channels in the image to track using the track channels dropdown. |
If this is set to anything other than all or none, use the checkboxes to select the required channels.
| 3. | Select the pre-track filter type to apply before pattern comparison using the dropdown: |
• none - no filter is applied.
• adjust contrast - the default filter, stretches the image contrast to better suit the tracking algorithm. This is the recommended setting and shouldn’t need changing in most circumstances.
• median - helps to remove noise from the pattern.
| 4. | Check adjust for luminance changes to force Tracker to calculate some extra pre-filtering to compensate for changes in brightness. This option slows the tracking process and can reduce the accuracy of tracks, so only enable this control if there are known changes in brightness. |
NOTE: Enabling adjust for luminance changes can occasionally produce better tracks on shots with no differences in luminance, particularly on jittery shots where sub-pixel accuracy is vitally important.
| 5. | Clamp super-white, sub-zero footage is enabled by default, restricting the pixel values within the pattern between 0-1. |
If you want to track the sequence using its full dynamic range, disable this control and increase max_error to a value large enough to cover the range. For example, a sequence with pixel values of 40 might require a similar max_error value.
| 6. | Enable show error on track paths to color code tracks showing their pattern matching error values, green for a good match through to red for a poor match. |
NOTE: The Viewer toolbar button also toggles this control on and off.
| 7. | Enable hide progress bar to free up Viewer real-estate while tracking. |
| 8. | Enable snap to markers to assist you when placing tracking anchors. See Positioning Track Anchors for more information. |
| 9. | Set when the zoom window is displayed using the show zoom window dropdown: |
• always - the window is always displayed.
• on track move - the window is only displayed when a track anchor is moved.
• when tracking - the window is only displayed during tracking.
• when tracking or track change - the window is displayed during tracking and when a tracking anchor is moved.
• never - the window is never displayed.
| 10. | Set the zoom widget’s size and magnification using the zoom size/mag. dropdowns. You can select custom and enter values manually for greater flexibility. |
| 11. | Proceed to Automatic vs. Keyframe Tracking to determine which tracking method suits your needs. |