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A 1D image is just a line, like you extract a single line out of a 2D gray scale image. A 2D image can be a grayscale or color image in layman's parlance, though in MATLAB, a 2D color image is actually a 3D image because it has 3 2D images - one for each color plane.
One Dimension (1D): A line segment drawn on a surface is an example of a one-dimensional object. It has only length and no width. ... Three Dimension (3D): This applies to solid figures or objects or shapes that have three dimensions–length, width and height. Three-dimensional shapes have thickness or depth.
A 1D image is just a line, like you extract a single line out of a 2D gray scale image. A 2D image can be a grayscale or color image in layman's parlance, though in MATLAB, a 2D color image is actually a 3D image because it has 3 2D images - one for each color plane.