Large Mandelbrot set image
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The Boundary Tracing algorithm
The Boundary Tracing algorithm [1,2] makes use of the fact that there are not
areas of one color "inside" areas of a different color. This means, that if
you trace the boundary of a region of a single color, then all the pixels
inside that area will have that one color also. In the left image below only
13% of pixels are calculated and all the rest are simply flooded. But it is
evident, that you can get wrong picture (to the right) for very large scale.
Click this image to "repair" it.
 Michael R. Ganss
 John Bailey
Boundary Tracing algorithm
updated 14 Sep 2013