Removing Dust Manually			Single Frame Dust Removal
Chapter 9, Removing Dust

Topics on this Page:

Analysing the Cut

Post-Analysis Clean-Up

You can have Lustre automatically remove dust from each frame in the sequence by analysing the frames based on specified parameter values. Once the analysis is complete, you will need to verify that each box created is around a legitimate dust artefact, and you may need to tweak the settings for some boxes.

Analysing the Cut

Analysis starts at the current frame and continues from shot to shot until you stop it. You can analyse forward or backward through the cut.

1. Optimize dust removal settings. See Optimizing Dust Detection.

2. Go to the frame where you want to start analysing.

3. Adjust the Analyse Contrast slider as needed.

   

   Backward Analyse button

   Forward Analyse button

   Analyse Contrast slider

   
   

   Low contrast values cause the algorithm to accept low colour value differences between corresponding pixels on the current, previous, and next frames. Therefore, low values result in more complete removal of the artefact. However, if the contrast is set lower than actually needed, adjacent pixels are modified more than actually required to remove the dust.

4. Click the Forward Analyse or Backward Analyse button.

   Lustre searches each frame for artefacts based on the parameters you set. It places an active box around each one it encounters and removes the artefact.

• Click anywhere in the grey area of the menu.

  Lustre finishes analysing the frame currently being analysed then stops.

Post-Analysis Clean-Up

Verify the analysis and tweak the results if needed. You can delete any boxes that are not surrounding legitimate artefacts. You can also tweak the contrast setting on individual boxes if needed.

Hint: If many boxes were created as a result of motion in the shot rather than dust particles, click Shot boxes to delete all boxes, increase the search area, click Set as Default again, and re-analyse the shot. You may need to experiment a bit to find the best value.

1. Visually scan the first analysed frame.

   Hint: To jump to the first or last frame in a shot where an artefact has been identified, use the First Analysed Frame button or the Last Analysed Frame button.

2. If you see a box that is not surrounding an artefact, or that you want to tweak, click inside it to select it.

   It becomes the only active box on the frame.

   Hint: Click the Previous and Next Box buttons to move from box to box.

   

   Don't Fix button	Previous Box button	Last Analysed Frame button
   First Analysed Frame button	Next Box button

   
   

3. If you need to see what has been removed, click Don't Fix. This shows you the contents of the box with no removal applied. If the artefact is genuine, click Motion Est again to reapply the Motion Estimation repair type.

4. Do one of the following as needed:

   • If the removed object is not an artefact, delete the box by clicking the Active boxes button or pressing Backspace.

   • If the object is an artefact but is not removed properly, tweak the Contrast, Grow and Soft Edge parameters. Enable or disable Show Mask as needed. When Show Mask is on, red pixels identify those areas affected by the removal process. Any changes you make are applied only to the artefact in the currently selected box.

5. If you are still unable to successfully remove the artefact, see Single Frame Dust Removal.