Various to plot an image histogram

Original image

>>  f = imread('flowers.jpg');

>> g = rgb2gray(f);

>> h = imhist(g);
>> h1 = h(1:10:256);
>> horz = 1:10:256;
>> bar(horz, h1)
>> axis([0 255 0 9000])
>> set(gca, 'xtick', 0:25:255)
>> set(gca, 'ytick', 0:1000:9000)

bar

>> stem(horz, h1, 'fill')

stem

>> plot(h)

plot