Ideally the background should not be part of the morph. The subject being morphed ought
to be composited back into the scene afterwards. This will prevent any disturbance to the
background; one less thing to worry about. If you already have mattes for both the source
and the destination, you can use the same key file to morph your mattes as a separate
process. Otherwise, create the mattes from the morphed sequence.
There may be occasions where you are just warping a small area of an image; making
somebody smile a little more, or adding a twitch. You can use the same principle of tying
down an area, as you did for the edges, by drawing curves on feature you do not want to
move.
- digitise in group number 0, the curve for the mouth.
- set the warp value to 1.0.
- select a S->D warp only.
- click preview to process the frame.
- the complete image is distorted.
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Source Image |
Warped with only 1 Curve |
- add another group by setting the group number to 1.
- digitise in lines over the required areas.
- key features you do not want to move - eyes, nose, mouth etc.
- follow the natural contours of movement - jaw, cheeks, smile lines.
- do not add any animation.
- set the Width G1 to 16. A radius of 16 pixels around the
curves in group 1, will not be moved. You may need to tune this so the fixed radius does
not limit the nature of the smile. Try a large value to see what happens.
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Natural Reduced Distortion |
- switch between the s-image and result to see what has happened
and if the movement is controlled enough.
- add more control curves if necessary or another group with a wider Width
radius. The idea is to make the move natural within the face. What does move when you
smile?
- or you could just scribble in the fixed areas!
Hint: the more points you have, the slower the processing will be.
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Scribble to Reduce Distortion |
Index