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color all pixels in an image black except white pixels

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Alberto Acri
Alberto Acri 2023-2-1
编辑： DGM 2023-2-1
Hi! From the attached .png figure [rxcx3] I would like to keep only the white pixels and turn all other pixels to black. How can I do?

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DGM
DGM 2023-2-1
编辑：DGM 2023-2-1
Ran in:
Presuming that "white" is [255 255 255] within the context of a uint8 RGB image:
inpict = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1280620/example_1.png');
inpict = im2gray(inpict);
mk = inpict == 255;
imshow(mk)

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