how to convert gray image to color image

Question

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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

编辑：Walter Roberson 2012-8-26

在 MATLAB Online 中打开

0 个投票

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

0 个投票

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);