MATLAB: How to draw histogram of an RGB image

histogram of rgb image

Best Answer

image_test=imread('Baboon.jpeg');
red_plane=image_test(:,:,1);
green_plane=image_test(:,:,2);
blue_plane=image_test(:,:,3);
[red_data pixel_level]=imhist(red_plane);
[green_data pixel_level]=imhist(green_plane);
[blue_data pixel_level]=imhist(blue_plane);
bar(pixel_level, red_data,'r');
hold on;
bar(pixel_level, green_data,'g');
bar(pixel_level, blue_data,'b');

Note: You can plot all in single matlab line code.

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MATLAB: How to get Color Histogram of an Image

Histogram is displaying the distribution of data. Color histogram shows distribution for each band.

    %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');

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