how to convert gray image to color image

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

[Image Analyst]

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]

Thanks Image Analyst. I shall follow it

Answer 1

[venkat vasu]

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...

[Sivakumaran Chandrasekaran]

Thanks venkat

Answer 2

[Titus Edelhofer]

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

[Image Analyst]

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);

[Sivakumaran Chandrasekaran]

Thanks Image Analyst

Answer 3

[Azzi Abdelmalek]

http://www.mathworks.com/matlabcentral/fileexchange/8214-gray-image-to-color-image-conversion

[Sivakumaran Chandrasekaran]

Thanks Azzi

Answer 4

[fereshte]

hi,i tested all codes in this post for my image.but output was gray image.why?

[Image Analyst]

It's possible for a color image to have only gray colors in it. Gray is a color too. If all your red, green, and blue channels were the same image, then creating a color image out of them will make a gray image.

If you want to apply a pseudocolor look up table to an image to create a pseudocolored image, you can use colormap() and ind2rgb().

[fereshte]

thanks.for jpg images, this code return me color image but for bmp color image give me graye image. original images are color(red.green.blue).i apply them in my code but output images were gray!! i use above codes to convert them to color image but output was gray image again.how correct it?

[Image Analyst]

Please post your image and your code as a new question.

[fereshte]

ok