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Old 11th September 2002, 16:36   #11  |  Link
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trbarry's Avatar
Join Date: Oct 2001
Location: Gainesville FL USA
Posts: 2,092
About resize, does anybody know if last bug of simpleresize.dll concerning chroma/luma shift has been solved?
Haven't find any post by trbarry talking about this... yet.
Sorry, some other stuff came up and I confess I haven't done anything on that. I'll try to get back to it soon.

But SimpleResize is just an optimized bilinear resize without the triangle filter. This means it goes faster but does not filter and is then (duh) best when you don't need any filtering. So if you had overly sharp material already (uncommon) then it could create aliasing artifacts if you downsized a lot. And of course it passes through all the noise, but also all the detail.

I think the more sophisticated (but slower) algorithms like BiCubic and Lanczos3 are general purpose and can do a much better job when upsizing, filling in gradients smoothly. SimpleResize probably wouldn't upsize very well, at least at ratios bigger than (swag) 1.5:1 or so. But of course for encoding purposes we are usually downsizing.

Anyway, I promise to go look for the chroma shift bug.

- Tom
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