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# how to create a histogram of R,G,B

Asked by preet on 19 Jun 2013

i have three component R(0-255),G(0-255),B(0-255) i draw 3 different histograms of each component of 8 bins but i need one 2-D histogram of 8 bins.

## 1 Comment

Jan Simon on 19 Jun 2013

What is your question? How do you want to transform the 3 components to a 2D space?

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Answer by Youssef KHMOU on 19 Jun 2013

hi,

You mean putting them on one figure, with each component its corresponding color :

```I=imread('autumn.tif');
R=imhist(I(:,:,1));
G=imhist(I(:,:,2));
B=imhist(I(:,:,3));
figure, plot(R,'r')
hold on, plot(G,'g')
plot(B,'b'), legend(' Red channel','Green channel','Blue channel');
hold off,
```

Answer by Image Analyst on 20 Jun 2013

What does this mean? Do you either want (1) histograms of each color channel (either on the same plot or on 3 separate plots), or (2) a scatterplot of the 3D color gamut? I have demos of each of those, just say what you want.

## 1 Comment

preet on 24 Jun 2013

1 histogram of each color channel on same plot