What is the best way for PDFBox to detect checked vs unchecked checkboxes in forms? I am thinking use the known x/y coordinates to pull the small image of the checkbox out as a BufferedImage then write code that determines if the box is filled in. Some boxes are solid black but some just have a 1-pixel wide X in them. Detecting a solid box would be easy. Detecting the X in the middle of an otherwise empty box would be harder. Is there some trick to this stuff that I should know?
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