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How do I convert g into a double then store it in a new variable then rescale the image with new values that range from 0 to 1 and then plot it?

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John Marl 2018-11-9

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Image Analyst 2018-11-9

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Try this:

g2 = mat2gray(g);

I don't know what it means to "plot" an image, but if you want to "display" it, use imshow():

imshow(g2, []);

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