Letterbox frames - halo/ringing on top and bottom frame edges

[Selur]

• if the source already has those edge arfifacts:crop, remove artifacts (use Frame->Edge filters, but move them behind the crop), upscale, then add borders
  
• if your source, does not have those edge artifacts: crop, upscale, then add borders
  
• don't sharpen too much during upscaling or filtering
  
• (remove the halos with a dehalo filter)
  

Cu Selur