How can I remove all the pixels in an image except pixels colored black?

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Jordan
Jordan 2014-9-3
回答： sandeep 2014-11-20
I have taken pictures of drawings, and I want a script that will leave me with the 'shell' of my original drawings. All I want to remain from my original drawings, are pixels that are colored black. Can someone help me?

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sandeep
sandeep 2014-11-20
I need to see the image to advise on that. However, I believe basic thresholding operation would help solve the problem.

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