Get Color histogram of an image

Hi,

How can I get one color histogram of an image? I don't want three RGB histograms. I want one histogram. X-axis represents the color.

Thanks!

Answer 1

[Image Analyst]

What's your definition of color? The hue? You can take the histogram of the hue channel if you want:

hsvImage = rgb2hsv(rgbImage);
hueImage = hsvImage(:,:,1);
histObject = histogram(hueImage);

[Chen Zhu]

Thanks! I am not sure how hue works. What value represent blue?

I am confused after reading https://en.wikipedia.org/wiki/Hue

They use degree to represent color, but matlab uses 0-1.

Thanks!