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
   before  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
   normal 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)


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