Apple Motion 3 - Manual (Page 927)

Chapter 10 Using Filters 927
HUD Controls
The HUD contains the same controls as the Inspector, with the exception of the Mix
control.
Matte Filters
Matte filters are used to modify mattes.
Matte Choker
This filter increases or decreases the semi-transparent area of an object’s alpha channel
by performing a gamma correction (similar to the Gamma color correction filter) to all
regions of the alpha channel falling between solid black and solid white. This allows
you to widen or narrow the semi-transparent areas within an object, while leaving all
100% solid and transparent areas unaffected.
Parameters in the Inspector
Edge Thin: Higher positive edge thin values eat into the alpha channel, eliminating
fringing around the edges of translucent areas. Negative values fill in translucent areas,
filling in holes and widening the matte into regions of fringing.
Feather: Lower values reduce the amount of translucency in a matte, but this results in
harder edges around holes and edges in the alpha channel.
Mix: Sets what percentage of the original image is blended with the filtered image.
Values range from 0 to 100%.
HUD Controls
The HUD contains the Edge Thin and Feather controls.
Matte Magic
This filter shrinks and softens the edges of a matte.
Original image with rectangular matte Matte Magic filter applied