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

Question

Arshad Ali 2019-6-23

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回答： Image Analyst 2019-6-24

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);

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Guillaume 2019-6-24

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?

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Answer 1

Sulaymon Eshkabilov 2019-6-23

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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.

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Arshad Ali 2019-6-24

sir its not working for me

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Answer 2

Image Analyst 2019-6-24

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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));