How to show histogram of RGB image in Matlab?

Question

I read an image in matlab using

input = imread (\'sample.jpeg\');

Then I do

imhist(input);

It gives this

Answer 1

I pefere to plot the histogram for Red, Green and Blue in one plot:

%Split into RGB Channels
Red = image(:,:,1);
Green = image(:,:,2);
Blue = image(:,:,3);

%Get histValues for each channel
[yRed, x] = imhist(Red);
[yGreen, x] = imhist(Green);
[yBlue, x] = imhist(Blue);

%Plot them together in one plot
plot(x, yRed, 'Red', x, yGreen, 'Green', x, yBlue, 'Blue');