coloration the pixels matlab

I have two images image 1 and image 2 . I want to realise the image 3.

If image1(x,y) ==0 , image2(x,y)==0 so image3(x,y) color in Black

if image1(x,y) ==1 , image2(x,y)==0 so image3(x,y) color in Red

if image1(x,y) ==1 , image2(x,y)==1 so image3(x,y) color in white

if image1(x,y) ==0 , image2(x,y)==1 so image3(x,y) color in Blue

I want to realise image 3

helpme plzz

Answer 1

[Rik]

The easiest way to do this is to create an index image and then use ind2rgb to convert to a color image.

im1=imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/905945/image%201.JPG');
im2=imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/905920/image%202.JPG');
%crop and convert to 0 and 1
im1=mean(im1(1:65,1:64,:),3)>128;
im2=mean(im2(1:65,1:64,:),3)>128;

im3=NaN(size(im1));
im3(im1==0 & im2==0)=1; %edited
im3(im1==1 & im2==0)=2;
im3(im1==1 & im2==1)=3;
im3(im1==0 & im2==1)=4;
map=[...
    0 0 0;
    1 0 0;
    1 1 1;
    0 0 1];
im3=ind2rgb(im3,map);
subplot(1,3,1),imshow(im1),title('im1')
subplot(1,3,2),imshow(im2),title('im2')
subplot(1,3,3),imshow(im3),title('im3')

[randino randino]

@Rik thank you but that's not what i want

[Rik]

Then you will have to explain again. As far as I can tell this is exactly what you described. Since you didn't provide any hint about what should be different, I don't see what I should change about my answer.

Note that your images did not have the same dimensions, so I had to crop them. Maybe that is why the image doesn't match your expectations?

[randino randino]

@Rik like this, in image 1 pixel = 1 and in image 2 = 0 so image 3 pixel in red

in our resul in image 3 color in black and different pixels his results are not exactely

[Rik]

I didn't read the doc carefully enough:

• If you specify X as an array of integer data type, then the value 0 corresponds to the first color in the colormap map. For a colormap containing c colors, values of image X are clipped to the range [0, c-1].
• If you specify X as an array of data type single or double, then the value 1 corresponds to the first color in the colormap. For a colormap containing c colors, values of image X are clipped to the range [1, c].

Because im3 is a double, that means the first value should have been 1, not 0. You can either fix that, or a new line in the colormap.

% Simplified example to make the effects more visisble.
im1=[0 0;1 1];
im2=[0 1;0 1];

im3=NaN(size(im1));
im3(im1==0 & im2==0)=1;
im3(im1==1 & im2==0)=2;
im3(im1==1 & im2==1)=3;
im3(im1==0 & im2==1)=4;

map=[...
    0 0 0;
    1 0 0;
    1 1 1;
    0 0 1];
im3=ind2rgb(im3,map);
subplot(1,3,1),imshow(im1),title('im1')
subplot(1,3,2),imshow(im2),title('im2')
subplot(1,3,3),imshow(im3),title('im3')