How I can do edge detection to almost white picture where are black lines/edges?

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Teemu
Teemu 2013-2-6
How I can do edge detection to almost white picture where are black lines/edges? So I want to do edge detection to black edges.
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Jan
Jan 2013-2-12
I've closed this question, because the body is empty. It is re-opened automatically, if you add the required details in the currently empty body of the question.

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ChristianW
ChristianW 2013-2-26

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