Manual: pambayer

Pambayer User Manual(1)				   General Commands Manual			     Pambayer User Manual(1)

NAME
       pambayer - interpret Bayer patterns

SYNOPSIS
       pambayer -type={1|2|3|4} [-nointerpolate] [pamfile]

       Minimum	unique	abbreviation of option is acceptable.  You may use double hyphens instead of single hyphen to denote
       options.	 You may use white space in place of the equals sign to separate an option name from its value.

DESCRIPTION
       This program is part of Netpbm(1).

       pambayer reads a Bayer pattern in a 1-deep Netpbm image and produces a color image in PAM RGB format as output.

       A Bayer pattern is what you get from the optical sensor in some digital cameras.	 Such a camera doesn't have  a	red,
       green, and blue sensor in the exact same place for an individual pixel.	Instead, it has red, green, and blue sensors
       laid out in a two dimensional array.  The pattern in which they are laid out is the Bayer pattern.  The input to pam‐
       bayer is one sample value for each of those sensors, so some samples are red, some are green, and some are blue.

       pambayer turns that into a regular visual image with one pixel per sensor.  For the two components of each pixel that
       are  missing  in	 the corresponding Bayer input, pambayer averages the sample values from the adjacent pixels that do
       have that component.

       But you can have pambayer fill in black instead (see the -noninterpolate option), which gives you a simpler represen‐
       tation of what the camera saw, on which you might do further processing.	 Such an image	still  looks  right,  though
       considerably dimmer, if you stand far enough away and let your eyes do the interpolation.

       The  input  image is a pseudo-PNM image (pseudo- because while the structure is the same, the sample values have dif‐
       ferent meanings) or PAM image of arbitrary tuple type.  pambayer looks at only the first plane of the input.

       The output image is a PAM image of tuple type "RGB", i.e.  a standard color image.  You can convert this to PPM	with
       pamtopnm(1).

       If you're interested in just one of the primary colors, use pamchannel on the output of pambayer to extract it.

OPTIONS
       In  addition  to	 the  options common to all programs based on libnetpbm (most notably -quiet, see  Common Options ),
       pambayer recognizes the following command line options:

       -type=n
	      This tells which Bayer pattern the input is:

       1      GBG/RGR/GBG matrix

       2      RGR/GBG/RGR matrix

       3      BGB/GRG/BGB matrix

       4      GRG/BGB/GRG matrix

	      This option is mandatory.

       -nointerpolate
	      Each output pixel position corresponds to one position in the input Bayer pattern, which means only one of the
	      three color components is supplied by the input.	For the other two, this option says to user  zero.   Without
	      it, pambayer instead interpolates from the adjacent pixels that do have that color component.

	      This option was new in Netpbm 10.49 (December 2009).

SEE ALSO
       cameratopam(1) pam(1)

HISTORY
       pambayer was new in Netpbm 10.30 (October 2005).

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

	      http://netpbm.sourceforge.net/doc/pambayer.html

netpbm documentation				       18 August 2005				     Pambayer User Manual(1)