9

346 Chapter 19: Video Post-Production
Effect of negative filter
When you click the Setup button in the Edit Filter
EventdialogfortheNegativefilter,theVideoPost
dialog is replaced by a modeless Negative Filter
dialog with a Blend spinner. You can turn on
AutoKey,movethetimeslider,andchangethe
Blend value to create keys. (You can also use other
3ds Max functions; for example, you can create
objects.) When you’ve set al l the keys you want,
click the OK button to return to Video Post.
AftercreatingkeysfromtheVideoPostfilter,you’ll
find the track for the new keys as a chi ld of the
Video Post track in the T rack View – Curve Editor.
Specifically, in the above example, you’ll find the
following hierarchy in the Curve Editor:
Interfa ce
Blend—Sets the amount of blending that occurs.
Pseudo Alpha Filter
Rendering menu > Video Post > Video Post toolbar > Add
Image Filter Event > Choose Pseudo Alpha Filter from the
Filter Plug-In list.
Rendering menu > Video Post > Video Post window
> Select a Contrast Filter. > Video Post toolbar > Edit
Current Event
The Edit Pseudo Alpha fi lter creates an alpha
channel for the image based on the image’s first
pixel (the upper-left corner pixel). All pixels
that have the s ame color as this pixel become
transparent.
Because only one pixel color becomes clear, edges
oftheopaqueareasarealiased.Themainusefor
this filter is when you want to composite a bitmap
whose format does not have an alpha channel.
There is also a layer event called the Pseudo Alpha
Compositor (page 3–382) .
There are no setup options for t his filter.