reconstruction of a color

Question

Mohammad Golam Kibria 2011-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/7459-reconstruction-of-a-color

Hi suppose I have an image. It shows 2 colors visually.I need two know whether there is actually 2 colors or many different colors. I have used the following code.but perhaps Im not getting the right answer:

Here I seems to have two bars of two colors.

I1=rgb2hsv(I);

color=zeros([30,50,3],'double');

r=size(I1,1); for r=1:size(I1,1); for c=1:size(I1,2)

        h=num2str(I1(r,c,1));
        s=num2str(I1(r,c,2));
        v=num2str(I1(r,c,3));
        filename=strcat(path,num2str(r),'\',num2str(r),num2str(c),'h=',h,'s=',s,'v=',v,'.jpg');
        color(:,:,1)=I1(r,c,1);
        color(:,:,2)=I1(r,c,2);
        color(:,:,3)=I1(r,c,1);
        hsvcolor=hsv2rgb(double(color));
        imwrite(hsvcolor,filename,'jpg');
    end
end
am i doing the right process?If not what is necessary for correction?

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Answer 1

Walter Roberson 2011-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/7459-reconstruction-of-a-color#answer_10244

在 MATLAB Online 中打开

T = reshape(I1,[],3);
U = unique(T,'rows');
if size(U,1) > 2
  disp('there were more than 2 colors');
end

Though this does depend upon what you mean by "color"; possibly you just want to compare hues?

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Mohammad Golam Kibria 2011-5-15

Yes, I want to compare hues and also want to know how much hue difference makes visible color difference in our eyes.So I need a program that will be of different hue but saturation and value will be same. But any file saved in takes array hue value as rgb value. can you suggest me how to write that type of program?

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