RESAMPLE(9.1)                                       RESAMPLE(9.1)

     NAME
          resample, pdup - resample a picture

     SYNOPSIS
          fb/resample width [ input ] [ B C ]

          fb/pdup sx sy [ input ]

     DESCRIPTION
          Resample resamples the scan lines of its input image
          (default standard input) to the given new width.  The image
          is decimated or interpolated using a well-designed cubic
          filter.  See transpose(9.1) for assistance with vertical
          resampling.

          The reference explains the optional filter parameters B and
          C. The default values give optimal alias rejection, and
          should not normally be tampered with.

          Pdup scales an image by pixel duplication.  Sx and sy are
          the horizontal and vertical scale factors.  They must be
          positive integers.  In the output image (written on standard
          output), each pixel of the input image (default standard
          input) generates an sx×sy block of identical pixels.

     SOURCE
          /sys/src/fb/resample.c
          /sys/src/fb/pdup.c

     SEE ALSO
          picfile(9.6), Don P. Mitchell and Arun Netravali, ``Recon-
          struction in Computer Graphics'', SIGGRAPH '88 Conference
          Proceedings.