Genius MESSENGER 310 - How to Avoid Background Movement Not Changing the Original Background?

English
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The following illustration shows how to fit an open mouth with the
anchor points.
•
How can I avoid background movement without changing
the original background?
Use the Background Mask Editing button and spread out the
background using the brush and clear tools. Don't get the mask too
close to the facial area and make sure that it does not overlap the head
of the model.
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