phpman > man > pamdeinterlace(1)

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 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)