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)