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. 

Plan 9  —  March 01, 2002