Plotting Pixel count in a image

What I actually want to achieve is to get pixel count of the image (see attached image) with different channels (Red, Green and overlap)

Is there a way to tell Matlab to count the total of pixels for each channel and plot them?

Answer 1

[KSSV]

I = imread(myimage);
R = I(:,:,1);
G = I(:,:,2);
B = I(:,:,3);
[R_data, level] = imhist(R);
[G_data, level] = imhist(G);
[B_data, level]=imhist(B);
bar(level, R_data,'r');
hold on;
bar(level, G_data,'g');
bar(level, B_data,'b');