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how to convert the background(white) of a image to blaclk.

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KRISHNA MOORTHY
KRISHNA MOORTHY 2012-4-13
I obtained a image which is output of my intermediate process.It contains white background and small gray patches(grayscale image).I want the background to be black.Please suggest me a solution.

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Image Analyst
Image Analyst 2012-4-13
You mean like this:
grayPatchGrayLevel = 150; % or whatever it is.
% Turn anything brighter than that to black.
grayImage(grayImage >= (grayPatchGrayLevel +1)) = 0;
Or, if you know for a fact that all your "white" is actually exactly 255, then:
grayImage(grayImage == 255) = 0;

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