Is this code creating a matrix for the image or is it doing something else?

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Recap 2016-3-26

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回答： Image Analyst 2016-3-26

采纳的回答： Image Analyst

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What exactly are these 3 lines doing?

im2(:,:,1)=im1;
im2(:,:,2)=im1;
im2(:,:,3)=im1;

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Image Analyst 2016-3-26

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They're creating a 3D matrix where every slice/channel/plane is the same - it's im1. So im2 can either be a color image that appears as grayscale because all 3 color channels are identical, or it can be a volumetric image (like a CT or MRI image) where all three slices/planes are the same, like you extruded the im1 image upwards.