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CentOS 7.0 - man page for ppm3d (centos section 0)

Ppm3d User Manual(0)							     Ppm3d User Manual(0)

NAME
       ppm3d - convert two PPM images into an anaglyph (red/blue 3d glasses) PPM

SYNOPSIS
       ppm3d [-color] [-offset=horizontal_offset] leftppmfile rightppmfile

       Deprecated optional 3rd argument: horizontal_offset

DESCRIPTION
       This program is part of Netpbm(1)

       ppm3d reads two PPM images as input and produces a PPM as output, with the images overlap-
       ping by the specified number of pixels in blue-green/red format.  The idea is that if  you
       look  at  the image with 3-D glasses (glasses that admit only red through one eye and only
       green or blue through the other), you see an image with depth.  This is called an anaglyph
       stereogram.

       ppm3d  can  produce  either of two kinds of anaglyph stereogram: monochrome or color.  Use
       the -color option to choose.

       In the monochrome version, ppm3d ignores any color (actually, chrominance)  in  the  input
       images  and produces a result which is monochrome.  Viewed through red-green glasses it is
       yellow, but without any other color in the field, your brain tends to see it as grayscale.

       In the color version, ppm3d generates a result which is close to the color of  the  origi-
       nal.   It's  not  great,  though, due to the fact that each eye necessarily cannot see the
       entire spectrum.  Red and cyan don't work well, but most other colors --  especially  when
       heavily saturated -- come out quite well.

       To  view  a  color anaglyph stereogram, you need glasses with a left lens that admits only
       red light and a right lens that admits only blue and green light.  (The right lens may  be
       called a cyan lens because that is its pigment in white light; don't be misled into think-
       ing that cyan is the only color that gets through it).  Your brain is wired so  that  even
       though  the  components	of  light  are coming in through different eyes, they mix in your
       brain to form the same sensation as if you were looking at the combined	light  with  both
       eyes.

       The input PPMs must be the same dimensions.

       To  make  a different kind of stereogram, use pamstereogram.  That makes a stereogram that
       you view without special glasses, just by letting your eyes unfocus so that each eye  sees
       different parts of the image.

ARGUMENTS
       The mandatory arguments are file names of the left and right input images.

       An  optional third argument specifies the same thing as the value of the -offset argument,
       but is deprecated because -offset is easier to use and read.  Before Netpbm  10.38  (March
       2007), this third argument is the only way to specify the offset.

OPTIONS
       -offset=horizontal_offset
	      This  option indicates the amount, in pixels, by which the left and image is offset
	      to the right of the right image in the output.

	      The effect of this option is to move the entire image forward (positive numbers) or
	      backward	(negative  numbers).  With a zero offset, the main subject of the picture
	      appears in the plane of the picture (i.e. if the image is projected  on  a  screen,
	      the location of the screen).  The main subject is the subject at the location where
	      the line of sight of the left camera intersects the line of sight of the right cam-
	      era  --  the  main  subject appears at the same location in both the left and right
	      images.

	      Default is zero.

	      This option was new in Netpbm 10.38 (March 2007).  Before that, use the third argu-
	      ment instead.  Also, before Netpbm 10.38 the default is +30 pixels.

       -color This  option  causes ppm3d to generate a color anaglyph stereogram.  By default, it
	      generates monochrome.

	      This option was new in Netpbm 10.38 (March 2007).

SEE ALSO
       pamstereogram(1)

       ppm(1)

AUTHOR
       Copyright (C) 1993 by David K. Drum.

netpbm documentation			 20 February 2007		     Ppm3d User Manual(0)


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