pammixinterlace man page on CentOS

Man page or keyword search:  
man Server   8420 pages
apropos Keyword Search (all sections)
Output format
CentOS logo
[printable version]

Pammixinterlace User Manual(0)			Pammixinterlace User Manual(0)

NAME
       pammixinterlace - mix adjacent lines to merge interlaced images

SYNOPSIS
       pammixinterlace

       [-filter={linear, fir, ffmpeg}]

       [-adaptive]

       [infile]

DESCRIPTION
       This program is part of Netpbm(1).

       pammixinterlace	is meant to operate on an image which is the interlac‐
       ing of two images, where raster rows 0, 2, 4, etc. are from  one	 image
       and  rows 1, 3, 5, etc. are from another.  (See below for why you might
       expect to encounter such an image).

       pammixinterlace makes each row of the output a mixture  of  the	corre‐
       sponding	 row  of the input and its two neighbors.  It uses half of the
       main row and a quarter each of the two neighbor rows.

       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  mov‐
       ing, this can detract from the quality of the image.

       In video data streams, you often find each frame contains only half the
       rows of the image -- the odd half or the even half.  The	 displayer  of
       the stream displays the rows in their proper positions on a CRT as they
       come in.	 When you display the rows in this order,  the	CRT  has  less
       flicker because a particular area of the screen gets refreshed twice as
       often.  In the process of capturing such a stream, computers often gen‐
       erate the interlaced image of the type that pammixinterlace works with.
       But this interlaced image, when displayed on a CRT, does not  look  the
       same  as	 if a displayer were rendering the stream directly on a CRT as
       it arrived, because of the timing of when the various pixels get	 drawn
       and subsequently fade.  That's why you need something like pammixinter‐
       lace.

       You may prefer the effect of simply extracting one of two images.   You
       can do that with pamdeinterlace.

OPTIONS
       -filter={linear,fir,ffmpeg}
	      This  option  chooses  between one of the three filtering mecha‐
	      nisms.  linear is a linear-blend formula.	 fir is a  size-5  FIR
	      low-pass	filter,	 and ffmpeg is a formula pulled from the docu‐
	      mentation of the program ffmpeg ⟨http://ffmpeg.mplayerhq.hu⟩ .

	      The default is fir.

       -adaptive
	      This option turns on "adaptive" filtering mode.	In  this  mode
	      pammixinterlace  modifies only pixels that are obviously part of
	      a "comb" pattern.

SEE ALSO
       pamdeinterlace(1), pam(1) pnm(1)

netpbm documentation	       22 February 2007 Pammixinterlace User Manual(0)
[top]

List of man pages available for CentOS

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net