Can you give me some tips and tricks on how to create a Stroke trimap?
Posted by Peter Moyer on 04 January 2008 12:23 AM
  • Make sure you place enough foreground and background strokes. A good stroke technique is to draw an inner outline around the object you are extracting using the Paint Foreground brush and an outer outline using the Paint Background brush.
  • The strokes should be near the boundary of the object, but not right up against the edge.
  • Strokes that are closer to the boundary will dominate the creation of the mask.
  • If the foreground or background has varying colors, the strokes should cover these colors.
  • After processing the mask, if you see gray areas in the foreground object that should be completely white, make additional foreground marks in those areas.
  • If you see gray mask areas in the background that should be completely black, make additional background marks.
  • If any fine foreground details are missing from the mask, click on the Unknown brush and draw over them with the left mouse button. This instructs EZ Mask to pay special attention to these areas and will help recover lost detail.
  • The general rule is don't put different stroke types too close together unless you need to.
  • Warning: If you only provide a few sparse strokes, a Stroke trimap will take longer to process than a filled trimap.
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