JCL Help:TResamplingFilter
JCL Help: TResamplingFilter Enumeration
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Summary
Filters for stretch function.
Pascal
public TResamplingFilter = (
rfBox,
rfTriangle,
rfHermite,
rfBell,
rfSpline,
rfLanczos3,
rfMitchell
);
Description
The filters used in the resampling code differ mainly in complexity but also in the way they calculate pixel contributions. These contributions are used to calculate the final pixel and depend on the original value and the values of neighbor pixels. How many pixel are taken into the calculation is determined by the filter radius, which essentially describes the number of pixels around a center pixel (the radius can be fractional to use partial pixels too). The reason why there are several filters instead of only one is that you can trade off speed against quality. For nearly interactive resampling only the box (and perhaps the triangle) filters are suitable. The quality resulting from those filters is only on average level. Filters like Lanczos3 or Bell produce much better results which are well comparable with those of Photoshop's bicubic interpolation.
About
Unit
Donator
Mike Lischke
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