You might have noticed a few overlapping principles from chapter to chapter of this book. These concepts have been mentioned in reference to specific ideas that pertained specifically to that principle. The reason these methods overlap is that the one, overall, all-encompassing goal when isolating a focus object is to keep your matte consistent. The mattes you create need to effectively and consistently cover your focus object.
These are a few ideas that have already been briefly covered:
• Limit your single splines to one or two edges of the focus object.
• Alter individual points along a spline as little as possible.
• If you must move individual points, try to keep the general proportions and relative point positions ...