How Photos displays Smart Albums from iPhoto or Aperture
Smart Albums that Photos displays
Existing Smart Albums from iPhoto or Aperture that use simple conditions appear similarly in Photos.
For example, an iPhoto Smart Album with images rated with two stars appears in Photos as a Smart Album with images with the keyword "2 Stars". An iPhoto Smart Album with images rated two stars or greater appears in Photos containing images with the keywords "2 Stars" or "3 Stars" or "4 Stars" or "5 Stars".
In both of these cases, the Smart Album displays the same images in Photos that it displayed in iPhoto or Aperture.