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Surfaces can be marked in two ways - by brush painting in the image or by making polygons, those ways can also be combined. Each surface class has one color assigned. For quick color switching, you can press a numeric key indicating the number of the class that is given in square brackets.
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Brush painting
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Read more about Feature Size (TODO)
Feature size determines the size of the surface defects the model is able to reliably find. Tweak the feature size by using the grid that appears and fit it according to the size of the image defects.
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