Specifies an image resizing algorithm. The following values are currently
supported: 0 (Nearest-Neighbor), 1 (Bilinear, default) and 2 (Bicubic).
The Nearest-Neighbor (NN) is the fastest but provides low-quality
thumbnails.
The Bilinear method offers much better thumbnail quality
but is approximately 2 times as slow as NN.
The Bicubic method is approximately
twice as slow as Bilinear and 4 times as slow as NN, but supposedly
offers the highest quality. In many cases, however, it provides little,
if any, noticeable
improvement over the Bilinear method.
Default: 1 (Bilinear).
See also: Section 4.1 - Resizing Algorithms.