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Sergey Sharybin c5c34ca65f Fix #34782 : Video Editor - Substract after transform fails

Couple of precision issues here:

- Interpolation was rounding trunkcating colors, and because
  of some precision issues value 254.999 became 254 leading
  to troubles later.

  Now color interpolaiton will do rounding to nearest int.

- Subtract was setting channels to something negative which
  confused color management (especially negative alpha),

  Now subtract effect will clamp channels to 0 from bottom
  and also do some tricks to prevent small alpha which
  could also confuse color management.

2013-03-28 08:21:29 +00:00