error in converting image to binary

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FIR
FIR le 1 Mar 2012
I have a rgb image inwhich the image consists of two persons,i want to make the background black and persons in white colour,i tried im2bw but i get only whit backgroubf,no image duisplayed ,please help

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Pugazhendhi
Pugazhendhi le 1 Mar 2012
First convert to grayscale(rgb2gray) then use im2bw
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FIR
FIR le 1 Mar 2012
I tried but getting same result

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Walter Roberson
Walter Roberson le 1 Mar 2012
See graythresh()

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