Sorry for the late response.
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From the way these are expressed, I assume that they are calculated using the 'Panorama Tools' method (as for existing Spline16, etc), rather than the alternative method of fitting a spline through the kernel crossing points.
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Yes, indeed.
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Any thoughts on the relative merits of the two approaches? It is clear that they give different coefficients and I suspect they are fundamentally different in nature, although they may both be equally valid as approximations to a sinc filter.
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The coefficients seem to be close to each other (well i only looked at Spline64, dunno about the other ones). I implemented both resizers here:
http://www.geocities.com/wilbertdijk...Resize_v01.zip
For the alternate method you can choose the number of "taps". I leave it up to you guys to find and report about the differences