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Subject: Re: Embedded Image Resizing using FFT
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> Matt, your point on symmetry was correct and removes the imaginary component. However, the intensity scale still changes. Quality is ok, but there are still some high frequency artifacts - most visible at the top of this image, but more visible still on the cameraman image.

Sinc-ripple, I suspect. As I was saying, the technique is a combintion of sinc-interpolation and subsampling operations...