class Vips::Kernel
A resizing kernel. One of these can be given to operations like {Image#reduceh} or {Image#resize} to select the resizing kernel to use.
At least these should be available:
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`:nearest` Nearest-neighbour interpolation.
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`:linear` Linear interpolation.
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`:cubic` Cubic interpolation.
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`:lanczos2` Two-lobe Lanczos
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`:lanczos3` Three-lobe Lanczos
For example: ```ruby im = im.resize 3, :kernel => :lanczos2 ```