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Pambayer User Manual(0) 						  Pambayer User Manual(0)

       pambayer - interpret Bayer patterns

       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.

       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 individ-
       ual 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 aver-
       ages 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 representation 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 different 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.

	      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.

	      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  inter-
	      polates from the adjacent pixels that do have that color component.

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



       pambayer was new in Netpbm 10.30 (October 2005).

netpbm documentation			  18 August 2005		  Pambayer User Manual(0)
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