I'd like to plot color image histograms that combine color as RGB

Question

Jessada Dissopa 2020-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/575482-i-d-like-to-plot-color-image-histograms-that-combine-color-as-rgb

编辑： Adam Danz 2020-8-10

I'd like to plot a histogram of color images that look like this

when each color band overlaps it change colors according to the RGB combination of it. Like Red-Green overlapped area produces Yellow, Green-Blue produces Cyan etc.

Thank you in advance.

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Answer 1

Adam Danz 2020-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/575482-i-d-like-to-plot-color-image-histograms-that-combine-color-as-rgb#answer_475567

编辑：Adam Danz 2020-8-5

在 MATLAB Online 中打开

By setting transparency to a value less than 1, overlapping histograms will show the combined colors. However, since the histogram colors are transparent, they aren't truely red, blue, and green and therefore the color combinations won't be truely yellow and cyan.

gaus = @(x,mu,sig,amp,vo)amp*exp(-(((x-mu).^2)/(2*sig.^2)));
x = 1:100; 
g1 = gaus(x,10,5,10); 
g2 = gaus(x,28,5,12); 
g3 = gaus(x,43,11,7); 
figure()
hold on
bins = 0:100; 
h(1) = histogram('BinEdges',bins,'BinCounts',g1, 'FaceColor', 'b');
h(2) = histogram('BinEdges',bins,'BinCounts',g2, 'FaceColor', 'g');
h(3) = histogram('BinEdges',bins,'BinCounts',g3, 'FaceColor', 'r');

The transparency levels can be changed using

set(h,'FaceAlpha',.4) % 0=completely transparent, 1=opaque

Of course you could compute the individual bar positions (histcounts) and which ones overlap in order to plot the overlapping and non-overlapping regions individually. Then you could set the colors of overlapping and non-overlapping regions independently.