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pamdeinterlace - remove ever other row from a PAM/PNM image
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.
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 sur-
round 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
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.
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.
11 November 2001 pamdeinterlace(1)
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