How to combine image with mask

hi , i read a image and want combine with mask that contain a line on it , i make a mask but i can't combine a image and mask that show line on the reading image

   im=imread('apple.jpg');
       mask=255*zeros(size(im));
       mask=insertShape(mask,'line',[50 50  250 250],'linewidth',10,'color',[255 255 0]);
       mask=uint8(mask);
       subplot(1,3,1);
       imshow(im);
       title('original');
       subplot(1,3,2);
       imshow(mask);

%    how to combine im and mask
%    im3 = combine(im , mask)

       subplot(1,3,3)
       imshow(im3);
       title('combine')

how can i do this and show line mask on original image?

Answer 1

[Walter Roberson]

im3 = im;
im3(mask ~= 0) = mask(mask ~= 0);

[sina alizadeh]

Tanks ! It's work

[Image Analyst]

This burns it into the image. If you just want the line in the overlay above the image without altering the image at all, use plot() or line().

[sina alizadeh]

i want to burns it in image , tanks for your help

Answer 2

[Changoleon]

im=double(imread('autumn.tif'));

red = im(:,:,1);
gre = im(:,:,2);
blu = im(:,:,3);

mask=255*zeros(size(red));
mask=insertShape(mask,'line',[50 50  250 250],'linewidth',10,'color',[255 255 0]);

mask_red = mask(:,:,1).*red;
mask_gre = mask(:,:,1).*gre;
mask_blu = mask(:,:,1).*blu;

[sina alizadeh]

tank's for your reply , i don't know how to use (mask_red , mask_gre , mask_blu) !

Answer 3

[Negesse Tadesse]

can i get split the image from the mask again? here what i want is masking rgb to gray and compress using LZW. please