How to get the Shape of the transparent portion of a BufferedImage in Java?

You could try it that way: treat the original image as an undirected graph whose nodes are the transparent pixels. Put an edge between adjacent nodes on the image (i.e. Transparent pixels that are directly above, left, right, below, and diagonal).

Find the connected components for that graph. Then for each connected component, compute its convex hull. Return a List containing each of those hulls, each hull being a Shape.

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