Pixel density revisited

Started Oct 22, 2008 | Discussions thread
DSPographer Senior Member • Posts: 2,464
Resize filtering

I never tested Photoshop's resize. It's disappointing that it doesn't properly filter first. I wonder what the bicubic smoother in the newer versions does? Your technique of first applying a Gaussian blur is much better than no filter but we should be able to do still better than that. Since the Fourier transform of a Gaussian is also a Gaussian the result has droop in the pass band while still retaining some energy that will alias. I think the filter window should look more like a sinc function in the vertical and horizontal directions.

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