[Bf-committers] Patch to fix aliasing problems.

[Nathan Vegdahl]

> Making Roberts code optional (or worse: a user option) won't solve the  
> problem for correct 'glow' effects.

   The cause of glow (as in the glow sequence plugin) in real life is as
follows:
   1) an area of the film recieves more light energy than it can handle.
   2) the extra energy "spills" into surrounding areas of the film.

   (The same thing happens with CCD's as well.)

   If the extra energy didn't spill, the film or CCD would be burned in that
area (this actually happened with earlier film).

   Thus, glow effects can be correctly synthesized assuming that you can
represent light energy that is greater than what can actually be displayed.

   In short, the high dynamic range afforded by the floating point
representation can be very useful for post processing effects.

--Nathan Vegdahl

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