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Plot multiple histograms in one figure and re-plot the overlay histogram

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Lim
Lim 上9 Jul 2015
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Commented: Lim2015年7月22日
I used the code provided by Image Analyst to plot multiple RGB histograms in one figure, the result is shown in the following figure.
I want plot a new histogram based on the overlaid histograms. I don't know how to put it in words about what I want to do but it is something like this...
I'm notsure how to do it. Can anyone help me please?
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Lim
Lim 2015年7月22日
Image = imread('001.bmp');
Red = Image(:,:,1);
Green = Image(:,:,2);
Blue = Image(:,:,3);
[PixelCountred Graylevels] = IMHIST（红色，256）;
[pixelCountGreen grayLevels] = imhist(Green, 256);
[pixelCountBlue grayLevels] = imhist(Blue, 256);
情节（PixelCountred，'r');
hold上;
情节(pixelCountGreen,'g');
情节(pixelCountBlue,'b');
Until this point, it will develop a plot with three histogram in one figure, as shown in figure above. May I know how do I plot the maximum lines of the histogram so it shows one graph with six peaks (as in the example figure)?

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