Legacy ImageMagick Discussions Archive

Works like a charm.

Thanks again.

P.S.: How can I mark the thread as solved?

Thanks everybody, perfect.

I'll give it a try and report.

Great forum!

Sorry for the confusion, actually I wanted to clarify what I mean ;)

The yellow pixels in the first image are the (black) pixels that are counted. The yellow line in the second image represents the edges to count.

However, I think your second solution is nearly what I want: counting black pixels ...

Thanks for your help so far.

-morphology gives me just what I asked for: an approximation for the perimeter of a black area on a white background. Here is a sample image: https://dl.dropboxusercontent.com/u/1534347/Bergahorn_2.png

However, counting black pixels with >=1 white neighbor it is just ...

Dear Forum Members,

after searching for many hours both here and everywhere, I decided to ask for help in the forum.

In a binary black-and-white image, I want to count the number of black pixels that have one or more white pixels in its direct neighborhood (8 surrounding pixels).

This shall serve ...