how to create a histogram of R,G,B

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preet
preet 2013-6-19
评论： Image Analyst 2022-2-19
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.
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Jan
Jan 2013-6-19
What is your question? How do you want to transform the 3 components to a 2D space?

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回答（3 个）

Youssef Khmou
Youssef Khmou 2013-6-19
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,
Image Analyst
Image Analyst 2013-6-20
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.
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Sumaiya Ali
Sumaiya Ali 2022-2-19
how can I get the x and y axis numbers for images when I use imshow() like in your output?
Image Analyst
Image Analyst 2022-2-19
@Sumaiya Ali what does "get" mean to you? You can try xticks(), xticklabels(), axis('on', 'image'), or other things. You have not explained very precisely what you want.

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Chinnu
Chinnu 2020-5-13
编辑：Image Analyst 2020-5-13
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

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