How to change the background colour of this image to 0 and foreground colour to 1 to make it binary.

I tried this code but not working properly.

% Extract the individual red, green, and blue color channels. 
redChannel = rgbImage(:, :, 1); 
greenChannel = rgbImage(:, :, 2); 
blueChannel = rgbImage(:, :, 3); 
% Now make the mask
mask = ~(redChannel ~= 0 & greenChannel == 0 & blueChannel == 0);

[Guillaume]

Your image looks like a labelised image to which false colours have been applied. Rather than trying to revert the false colouring, it would be better to work from the original labelised image. Don't you still have it?

Answer 1

[Sulaymon Eshkabilov]

Hi,

Here is a short code that reads and separates the three layers of colors:

AA = imread('Matrix.png');
R=AA(:,:,1);
G=AA(:,:,2);
B=AA(:,:,3);
imshow(AA)

RGB(:,:,1)=R;
RGB(:,:,2)=G;
RGB(:,:,3)=B;
imshow(RGB)
% Now you can change the values of any layer...

Good luck.

[Arshad Ali]

sir its not working for me

Answer 2

[Image Analyst]

You'd need

mask = ~(redChannel ~= 0 & greenChannel == 0 & blueChannel == 255);
% Mask the image using bsxfun() function to multiply the mask by each channel individually.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));