Here's an AppleScript solution for removing the anti-aliasing halo from a 32 bit image with DeBabelizer. The trick is to do a background removal on the alpha channel, then mask the image with it. Varing the 7th parameter between 1 and 255 will result in different amounts of "defringing". The example below will remove amout 33% anitialiasing. (The € char is option-8 for mac users.)

Here's the script... 

   tell application "DeBabelizer" ; Change this to the name of your Debab app. 
   do script "Channels€€Alpha"
   do script "Background Removal...
       * *
       0
       0
       0
       0
       1
       85  ; Change this number to 127 for 50% anti-alias removal.
       0
       0
       0
       "
   do script "Channels€€To Original Alpha"
   do script "Channels€€Mask Image Where Alpha Is 0"
   do script "Display Picture"
   end tell

Enjoy!

Cole Tierney