using the attached color image and ROI mask and how can I remove the background from the image and retain only the approximate ROI.
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Nosipho Majola
il 12 Dic 2021
Commentato: Image Analyst
il 12 Dic 2021
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/831900/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/831905/image.png)
the color image must have the dark background in the output image.
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Matt Gaidica
il 12 Dic 2021
IM = imread('ROI.png');
mask = logical(imread('mask.png'));
rmMask = bsxfun(@times, IM, cast(mask, 'like', IM));
close all
figure;
imshow(rmMask);
See also: Masking out Image area using Binary Mask
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Image Analyst
il 12 Dic 2021
Modificato: Image Analyst
il 12 Dic 2021
Looks like you've accepted Matt's answer so you probably don't need this but
rgbImage = imread('ROI.png');
mask = logical(imread('mask.png'));
% Make mask 3-D
mask = cat(3, mask, mask, mask);
rgbImage(~mask) = 0;
I haven't tested it but that will probably work. If it's not your homework, try that.
If it's your homework then you may not be able to use imread(), cat(), logical(), imshow(), etc. so see this link:
and of course you wouldn't be able to use our code either - that would be even worse than using built-in functions and you could face disciplinary action.
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Image Analyst
il 12 Dic 2021
OK, well if you run my demo with images called image1 and image2, it should look identical to the screenshot I posted in my last comment. If you alter it (like to handle your image names, or display things somewhat differently) and it doesn't work, then post your screenshot, two original images with the paperclip icon, and your code and I'll fix it.
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