xref: /plan9/sys/man/1/resample (revision 9a747e4fd48b9f4522c70c07e8f882a15030f964)
RESAMPLE 1
NAME
resample - resample a picture
SYNOPSIS
resample [ -x size ] [ -y size ] [ file ]
DESCRIPTION
Resample resamples its input image (default standard input) to a new size. The image is decimated or interpolated using a Kaiser window.

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 .

The input should be a Plan 9 image as described in image (6), and the output will be a compressed 24-bit r8g8b8 image. To uncompress the image or change the pixel format, use iconv (see crop (1)).

SOURCE
/sys/src/cmd/resample.c
"SEE ALSO
crop (1), image (6)
BUGS
Faster algorithms exist, but this implementation produces correct pictures.