Legacy ImageMagick Discussions Archive

Thank you, fmw42 and snibgo. White being 1.0 and black 0.0, `convert file1.bmp -fx "p[0,0]||((p[-1,0]+...+p[-1,-1])>5.1)" file2.bmp' does what I meant. The 3x3 window approach does not let treat the centre differently, does it? And, if it does not, polygonal concavities make things difficult.

I am trying to turn white those black pixels of a bilevel image that have less than 3 black neighbours. The original image is predominantly white. At least two things do not work as expected. (1) `convert file1.bmp -fx "p[0,0]&&((p[-1,0]+...+p[-1,-1])>2.7)" file2.bmp' works long and turns several ...