How do I apply a mask to a gray image?

Hey guys I'm trying to apply a mask to an image which I need to work on, I've tried to use the following code and didnt get what I need.

This is the image: http://imgur.com/flVD3Wn

And this is the mask Im trying to apply: http://imgur.com/rHuwzSH

 I=imread('02_dr.JPG');
 mask=imread('02_dr_mask.tif');
 J=rgb2gray(I);
 subplot(2,3,1); imshow(J), title('Original Grayscale');
 subplot(2,3,4); imhist(J), title('Histograma 1');
 subplot(2,3,2); imshow(mask), title('Mask');
 subplot(2,3,5); imhist(mask), title('Histograma Mask');
 % Mask the image using bsxfun() function
 maskedImage = bsxfun(@times, J, cast(mask, 'like', J));
 subplot(2,3,3); imshow(maskedImage), title('MaskedImage');
 subplot(2,3,6); imhist(maskedImage), title('Histograma MaskedImage');

I have also tried the following instead of Inew = image.*repmat(mask,[1,1,3]);

 Inew=image.*mask;

Answer 1

[Image Analyst]

First of all, don't ever call your image "image" because that is the name of a very important built-in variable.

Try this:

% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));

[Adriano Morais]

Can you tell me what does @times means?

• I=imread('02_dr.JPG');
• mask=imread('02_dr_mask.tif');
• J=rgb2gray(I);
• subplot(2,1,1); imshow(J), title('Image grayscale');
• % Mask the image using bsxfun() function
• maskedRgbImage = bsxfun(@times, J, cast(mask, 'like', J));
• subplot(2,1,2); imshow(maskedRgbImage), title('maskedRgbImage');
• Here is the new code I made, the final image that I got is the same as the mask. http://prntscr.com/b1z1sz , do you think this is correct?

[Image Analyst]

No, it shouldn't. Use subplot(2,2,n) and show all 3. Then attach the jpg image and tiff mask files. I'll look at it later this morning.

[Adriano Morais]

I have uploaded my image, the mask, and the code.

[Adriano Morais]

So can you still help me?