Usage guide for Compositing with Carbon Basic Keyed Filters Tab Controls
These controls create or modify keyed filters attached to an image.
From top to bottom, left to right:
Filter - selects which one of many possible filters active at the current time.
Start - sets the time when this filter becomes active, relative to the element's display time.
Duration - sets the duration of the filter.
New - used to create a new keyed filter which starts at the current time.
Positioning - used to offset the generated key channel data in the x and/or y direction.
Channel Slope - sets the minimum and maximum values for the generated key channel. This is used to scale the
data from the key source. Note: By reversing the min and max values an inverse mask can be produced, there is also a checkbox for inverting
the mask. If both are used a non-inverted mask is created.
Key number and Source - selects the image or object which will be used to form the key channel data.
Delete - removes the currently selected filter.
The options checkboxes:
Key starts at time 0 - if the key source is a motion object, such as a transition mask, which can be used at any point in the timeline checking this
option will override the current time value with 0 before drawing the key source.
Key duration matches filter - if the key source is a motion object checking this option will override the duration of the motion with the duration of this filter.
Run transition in reverse - if the key source is a motion object the time passed to the drawing function will be altered to cause the motion of the key
object to run backwards.
additional options specific to the selected filter.
Edge softness - the value is approximately the number of pixels in either direction based on the final mask dimensions of blurring to be applied
to the edges of the mask.
Channel Type - the options here depend on the type of filter selected.
Channel source - selects which of 3 key sources and what type of data to use in forming the key.
Mask type dropdown - selects resizing options for the mask as follows:
center actual - disregards the position values of the key source so that regardless of where the key source would appear in the composite it is centered
before applying the offset (see above "Positioning"). The size of the mask is the actual size of the key source as it appears in the composite.
follow key - the mask will align with the key object in the composite prior to applying the offset, and be actual size.
Virtual mask - the mask is resized as if the image being filtered is the entire composite.
full size - the mask is centered prior to applying offset and resized to the dimensions of the image being filtered.