MATLAB: How to reset the colored image after I converted into grayscale

digital image processing

I have 4.jpg as image.1st i am converting it into grayscale to apply imhist(). I am getting grayscale enhanced image as output but I need the enhanced colored image as output. How to do that? I tried using colormap as shown in code below. But its not working
I = imread('4.jpg');
imshow(I)
R = rgb2gray(I);
figure
imshow(R)
in = histeq(R);
figure;
imshow(in);
figure;
imhist(in);
y=colormap(hot(110));
   imwrite(R,y,'4.jpg','jpg'); 
   imshow('4.jpg');
%    I=imread('4.jpg');
%    R=rgb2gray(I); % It is gray now
% %    y=colormap(hot(110));
% %    imwrite(R,y,'rgb.jpg','jpg'); % Re-change it to colored one 
% %    T=imread('rgb.jpg');
% 
% imshow(T);
%  imshow('4.jpg');

Best Answer

Nothing is stopping you from performing histogram equalisation on each colour channel, if that's what you're after:
rgbimage = imread('4.jpg');
equalisedimage = rgbimage;   %copy for simplicity
for channel = 1:3   %iterate over the 3 colour channel
   equalisedimage(:, :, channel) = histeq(rgbimage(:, :, channel));  %apply histogram equalisation to each channel
end
imshowpair(rgbimage, equalisedimage, 'montage');
I would advise you to use meaningful variable names as I've done here instead of your meaningless (and misleading!) one letter variable names.
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