i have three component R(0-255),G(0-255),B(0-255) i draw 3 different histograms of each component of 8 bins but i need one 2-D histogram of 8 bins.
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You mean putting them on one figure, with each component its corresponding color :
I=imread('autumn.tif'); R=imhist(I(:,:,1)); G=imhist(I(:,:,2)); B=imhist(I(:,:,3)); figure, plot(R,'r') hold on, plot(G,'g') plot(B,'b'), legend(' Red channel','Green channel','Blue channel'); hold off,
What does this mean? Do you either want (1) histograms of each color channel (either on the same plot or on 3 separate plots), or (2) a scatterplot of the 3D color gamut? I have demos of each of those, just say what you want.