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How to change the white lines to black?

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Selina Loh
Selina Loh 2017-10-25
回答： Rik 2017-10-25
Is it possible to change the white lines to black?

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Rik
Rik 2017-10-25
Yes.
If you convert this to a greyscale image, you should be able to determine a threshold that covers most white/grey pixel. You could also add additional checks if the RBG values are sufficiently similar (i.e. a grey or white pixel)

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