resample – resample a picture|
resample [ –x size ] [ –y size ] [ file ]|
Resample resamples its input image (default standard input) to
a new size. The image is decimated or interpolated using a Kaiser
The size of the resampled image can be specified with the –x and –y options. An unadorned value sets the number of pixels of that dimension; a suffixed percent sign specifies a percentage. If only one of –x or –y is given, the other dimension is scaled to preserve the aspect ratio of the original image. Thus, –x50% will reduce the image to half its original dimension in both x and y.
Faster algorithms exist, but this implementation produces correct