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This Smath document demonstrates the Fourier 0 padding center to zoom an image matrix. Here, applied to each R,G,B component. This technique darkens the zoomed image ... luminosity must be zoomed too ! In fact, you can adjust at will. Though more Edu. than practical, nice to know how it works under the hood. CosmosSmall.BMP is the original RGB image The individual [r,g,b] are file type not allowed. Jean   Fourier 2D ZOOM Cosmos.sm (1,395kb) downloaded 36 time(s).
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