Gray image to rgb image

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Elysi Cochin 2013-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/85693-gray-image-to-rgb-image

评论： Image Analyst 2022-2-19

I converted a color image to gray using rgb2gray and denoised the image. Now i wanted to convert the denoised gray image to a color image... Is it possible.... Please can someone help me.... Please do reply....

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Answer 1

Image Analyst 2013-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/85693-gray-image-to-rgb-image#answer_95184

You can use ind2rgb() but you have to supply a colormap. It won't look like the original colors though - you lost those when you went to gray. Why don't you just denoise each channel one at a time? Or convert to hsv and denoise just the v channel. Either of those methods will not lose the color information like your method does.

I posted a demo here: Salt and pepper noise removal in a color image

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kailas jobu 2022-2-19

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i have this code that filters image,but when i use it with a colored image it turns grayscale. could you help me?

I = imread('phonebox2_noisy.bmp');
Im = rgb2gray(I);
noisy = imnoise(Im, 'salt & pepper',0.1);
[m,n] = size(noisy);
output = zeros(m,n);
output = uint8(output);
for i = 1:m
    for j = 1:n  
        xmin = max(1,i-1); 
        xmax = min(m,i+1);
        ymin = max(1,j-1);
        ymax = min(n,j+1);
        
        temp = noisy(xmin:xmax, ymin:ymax);
        
        output(i,j) = median(temp(:));
    end
end
figure(1);
set(gcf, 'Position', get(0,'ScreenSize'));
subplot(131),imshow(I),title('Original Image');
subplot(133),imshow(output),title('filtered image');