User Guide

Animation and Video 373
2 Create a brush stroke in the document window.
3 Open a movie file.
4 Choose Movie menu > Apply Brush Stroke to Movie.
Compositing Movies
You can composite two movies together into one — for example, you can composite a
foreground action against a new background. To do this, you must create a selection in
each frame of the foreground movie. For information about selections, refer to
“Creating Selections” in the Help. You can also create an alpha channel for each frame
and load it as a selection as you work. For more information, refer to “Creating,
Generating, and Importing Channels” in the Help.
When creating selections in the foreground movie, if the background is uniform — all
white, for example — you can take advantage of the automatic selection and script
features.
The drawing mode determines whether Corel Painter draws inside or outside of a
selection, so you can create selections that either include or exclude the foreground
image — whichever is easiest — then set the drawing mode accordingly. For more
information about drawing modes, refer to “Selecting a Drawing Mode” in the Help.
When you composite movies, it can take a long time to generate selections and paint
in the background for each frame. Using scripting in conjunction with the Auto Select
or Color Select commands can make this operation much easier and faster.
You can create a selection based on image characteristics or color. You do this once,
record the process as a script, and then apply the script to all frames in your movie. For
information about creating selections based on image characteristics, refer to “To
generate a selection with the Auto Selection command” in the Help. For information
about creating selections based on color, refer to “To generate a color-based selection”
in the Help. For information about recording scripts, refer to “Scripting” in the Help.
To composite one movie with another
1 Open the foreground movie.
2 In each frame, create a selection that defines the foreground image.
Because the foreground image continues to move, the selection in each frame must
be different.