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for png_name in pngs:
  # transparency
  convert .\png\png_name -fuzz 7.0% -transparent black .\png\tmp.png
  #alpha layer
  convert .\png\tmp.png -alpha extract .\png\tmp2.png
  # clean up alpha layer 
  convert .\png\tmp2.png -define connected-components:mean-color=true -define connected-components:area-threshold=200 -connected-components 4 .\png\tmp3.png
  # add blur to alpha layer boundary
  convert .\png\tmp3.png -blur 0x0.5 .\png\tmp3-b.png
  # compose orig image with alpha layer
  convert .\png\png_name .\png\tmp3-b.png -alpha off -compose copy_opacity -composite .\png\png_name + '-trsp-hd.png'
  # resize to proper D2R size
  convert .\png\png_name + '-trsp-hd.png' -resize 87.5% .\png_hd_resize\png_name + 'hd-resize.png'
  # sharpen the image
  convert .\png_hd_resize\png_name + 'hd-resize.png' -unsharp 0x1 .\png_hd_resize\png_name + 'hd-sharp.png'
  
  # Then convert pngs to .sprites using SpriteEdit