pamdeinterlace

pamdeinterlace(1)           General Commands Manual          pamdeinterlace(1)

NAME
       pamdeinterlace - remove ever other row from a PAM/PNM image

SYNOPSIS
       pamdeinterlace [-takeodd] [-takeeven] N [infile]

       You  can  use  the minimum unique abbreviation of the options.  You can
       use two hyphens instead of one.  You can separate an option  name  from
       its value with white space instead of an equals sign.

DESCRIPTION
       pamdeinterlace  Removes all the even-numbered or odd-numbered rows from
       the input PNM or PAM image.   Specify  which  with  the  -takeeven  and
       -takeodd options.

       This  can  be useful if the image is a video capture from an interlaced
       video source.  In that case, each row shows the subject 1/60 second be-
       fore or after the two rows that surround it.  If the subject is moving,
       this can detract from the quality of the image.

       Because the resulting image is half the height of the input image,  you
       will  then want to use pamstretch or pnmscale to restore it to its nor-
       mal height:

       pamdeinterlace myimage.ppm | pamstretch -yscale=2 >newimage.ppm

OPTIONS
       -takeodd
              Take the odd-numbered rows from the input and put  them  in  the
              output.   The  rows  are numbered starting at zero, so the first
              row in the output is the second row from the input.  You  cannot
              specify both -takeeven and -takeodd.

       -takeeven
              Take  the  even-numbered rows from the input and put them in the
              output.  The rows are numbered starting at zero,  so  the  first
              row  in the output is the first row from the input.  This is the
              default.  You cannot specify both -takeeven and -takeodd.

SEE ALSO
       pamstretch(1), pnmscale(1)

AUTHOR
       put by Bryan Henderson in the public domain in 2001

                               11 November 2001              pamdeinterlace(1)