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Old 16th March 2013, 04:24   #6  |  Link
xooyoozoo
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Join Date: Dec 2012
Posts: 197
Quote:
Originally Posted by akupenguin View Post
Why would you do that, rather than composing all of those steps into a single FIR filter? Same ideal result, less intermediate rounding, less cache thrashing.
That process is meant to be more of a way to deal with many image programs's limited set of sizing options rather than an efficient or even optimal approach. I thought it might apply here, as the OP seem to want to stick with swscale's current selection of scalers.

In any case, ImageMagick has a thorough page detailing its plethora of scaling algorithms and their relative sharpness and potential artifacts. Only some apply to swscale, but the resource could be useful. The author visits this forum too.
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