From: dannyb@panix.com   
      
   In  Lee Ayrton  writes:   
      
   >>> It's a demon face, not a skull. Single film frames at 24fps are well   
   >>> within the ability of humans to see - the old SMPTE projection leader   
   >>> with the countdown from 8 to 2 is an example: The "2" is exactly one frame.   
   >>   
   >> Ah, but that's a double flash, right?   
      
   >I don't follow what you mean by "double flash". In film projection each   
   >frame is interrupted three times as it is projected giving a flicker   
   >rate of 72cps and into the range of "persistence of vision" but the   
   >single "2" frame, coupled with a single frame of tone, is still easily   
   >visible.   
      
   I wasn't clear enough, I guess.  I meant that   
   each frame of film is flashed on the screen two times.   
      
   Of course, this gets changed, a lot, when used   
   on television...   
      
      
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