When using a defect map or dirt/dust/scratch detection, there may be some frames in which the parameters you are using are unable to clean the image without introducing additional unwanted errors. This may be because the defect map has not been generated accurately enough by the film scanner, or the clip contains significant complex motion that cannot be compensated for by the automated dirt detection algorithms. In these cases, Holdout Masks can be drawn over each frame to prevent dirt cleanup in those areas.
To draw a Holdout Mask, click one of the brush buttons on the right of the list: Rectangle, Ellipse, Lasso and Paint Brush. Clicking a dragging with the left mouse button in the Cinema window will then draw the holdout mask.
When using the Paint Brush mask, the size of the brush stroke can be adjusted by holding the Shift key and clicking and dragging with the left mouse button.
The Holdout Mask List contains all areas that have been drawn in the current frame. The scrub bar, located below the Cinema window, will show dark yellow indicators in frames where holdout masks have been drawn. One or more areas can be selected from the list by clicking with the left mouse button. Selected areas are highlighted in red in the Cinema window, and can be deleted by clicking the Delete button. Individual areas can be renamed by double-clicking in the Name column and entering a new name (Press the Return key to store the new name).