how to convert gray image to color image

Question

Sivakumaran Chandrasekaran 2012-8-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46698-how-to-convert-gray-image-to-color-image

评论： fereshte 2014-5-24

Image=imread('fog1.bmp');
[m n r]=size(Image)
rgb=zeros(m,n,3);
rgb(:,:,1)=Image;
rgb(:,:,2)=rgb(:,:,1);
rgb(:,:,3)=rgb(:,:,1);
Image=rgb/255;
figure,imshow(Image);

I am getting error in the line rgb(:,:,1)=Image;

Can anyone tell whats the error

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Image Analyst 2012-8-25

Siva, you've been asking enough questions here that you should learn how to format lines as code. Here's a tip: Just simply highlight the lines of code and click the {}Code icon above the text box. That will format it so that we will see it properly. I've done it for you this time but try to do it yourself next time - it's not hard. Thanks!

Sivakumaran Chandrasekaran 2012-8-26

Thanks Image Analyst. I shall follow it

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Answer 1

venkat vasu 2012-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/46698-how-to-convert-gray-image-to-color-image#answer_57116

编辑：Walter Roberson 2012-8-26

在 MATLAB Online 中打开

Image=imread('fog1.bmp');
if size(Image,3)==3
    Image=rgb2gray(Image);
end
[m n r]=size(Image);
rgb=zeros(m,n,3); 
rgb(:,:,1)=Image;
rgb(:,:,2)=rgb(:,:,1);
rgb(:,:,3)=rgb(:,:,1);
Image=rgb/255; 
figure,imshow(Image);

Try this code...

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Sivakumaran Chandrasekaran 2012-8-26

Thanks venkat

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Answer 2

Titus Edelhofer 2012-8-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46698-how-to-convert-gray-image-to-color-image#answer_57108

Hi,

what's the value of r? One? Or three? I guess your Image is already an RGB image, only that R, G and B are always equal (and therefore you have gray) ...

Titus

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Image Analyst 2012-8-25

在 MATLAB Online 中打开

So the proper code would most likely be:

rgbImage = imread('fog1.bmp');
[rows columns numberOfColorChannels] = size(rgbImage);
if numberOfColorChannels == 1
  % It's monochrome, so convert to color.
  rgbImage = cat(3, rgbImage, rgbImage, rgbImage);
end
imshow(rgbImage);