Specifying Premultiplication
Prev   Chapter 12. Image Effect Clip Preferences   Next

Specifying Premultiplication

All clips have a premultiplication state (see http://www.teamten.com/lawrence/graphics/premultiplication/ for a nice explanation). An effect cannot map the premultiplication state of the input clips, but it can specify the premultiplication state of the output clip.

The output's default premultiplication state is...

  • premultiplied if any of the inputs are premultiplied,
  • otherwise unpremultiplied if any of the inputs are unpremultiplied,
  • otherwise opaque.

Prev   Up   Next
Specifying Frame Rates  Home  Chapter 13. Actions Passed to An Image Effect