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how to threshold a color image?

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how to threshold a color image? How to set threshold value for a color image?
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Sivakumaran Chandrasekaran
by selecting any pixel values .. such as threshold=100 etc.,
Walter Roberson
Walter Roberson on 27 Nov 2013
It is not possible to express color by a single linear value. One could threshold on each color channel, but the result is not likely to be useful.

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Image Analyst
Image Analyst on 25 Nov 2013

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