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How can I create a stack of 3D png images that are in grayscale?

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Gaia Gbola
Gaia Gbola 2020-3-9
obj = VideoReader('IVUS 1.avi');
vid = read(obj);
frames = obj.NumberOfFrames;
for x = 1 : frames
imwrite(vid(:,:,:,x),strcat('frame-',num2str(x),'.png'));
end

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