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pfsinppm(1)		    General Commands Manual		   pfsinppm(1)

NAME
       pfsinppm	- Load images or frames	in PBM formats

SYNOPSIS
       pfsinppm	 (<file>  [--linear] [--absolute <max_lum>] [--frames <range>]
       [--skip-missing])  [<file>...]

DESCRIPTION
       pfsinppm	command	loads images in	PBM formats  (PPM,  PNM	 or  PGM)  and
       writes  pfs  stream  to	the standard output. The pfs stream is usually
       piped to	another	program	for further processing.	To detect  the	format
       automatically  based  on	the extension, use pfsin command. For more in-
       formation  on   PBM   formats,	refer	to   the   NetPBM   web	  page
       (http://netpbm.sourceforge.net/).

       Note that PPM or	PNM images are low dynamic range. Therefore pixel val-
       ues (0-255) are scaled to 0-1 before storing them in pfs	stream.	 Simi-
       larly,  before  writing	low dynamic range image	from pfs stream, pixel
       values are multiplied by	255.  By default, the 'LUMINANCE' tag  is  set
       to  'DISPLAY'.  The '--linear' switch can force the inverse sRGB	trans-
       formation and provide linear data. In this case the 'LUMINANCE' tag  is
       set to 'RELATIVE'. '--absolute' switch can be used to convert pixels to
       absolute	luminance values.

       To read images from standard input use a	single	dash  '-'  instead  of
       filename. The images are	read until EOF is reached.

       Each  file  can	contain	 a %d pattern, which is	substituted with frame
       numbers.	The pattern has	the same syntax	as C printf command. For exam-
       ple, you	can use	%04d to	make the frame number four digit with proceed-
       ings zeros. See the OPTIONS section below for details.

OPTIONS
       --frames	<range>
	      Range is given in	mathlab	/ octave format:

	      startframe:step:endframe

	      Frame numbers start with startframe (default 0),	are  increased
	      by  step	(default  1)  and stop at endframe You can skip	one of
	      those values, for	example	1:100 for frames 1,2,...,100 and  0:2:
	      for frame	0,2,4,... up to	the last file that exists.

       --skip-missing
	      Skip  up to ten frames in	a row if corresponding files are miss-
	      ing. Otherwise the program stops reading sequence	at  the	 first
	      file  that  does	not  exists. This switch does not apply	to the
	      first frame in a sequence. This switch can be useful if there is
	      a	rendered animation where some of the frame has not been	gener-
	      ated.

       --linear, -l
	      Converts pixel values to linear luminance	 (XYZ),	 assuming  the
	      sRGB  color  space  for the input	image. The maximum pixel value
	      (255,255,255) is mapped to Y=1. LUMINANCE	tag is	set  to	 RELA-
	      TIVE.

       --absolute <max_lum>, -a	<max_lum>
	      --absolute converts pixel	values to an absolute linear luminance
	      (XYZ), that is the color space, in which channel Y contains  lu-
	      minance given in cd/m^2. The sRGB	color space is assumed for the
	      input image. The maximum pixel value (255,255,255) is mapped  to
	      Y=_max_lum_. _max_lum_ is	typically set to 80 [cd/m^2] for a CRT
	      monitor. LUMINANCE tag is	set to	ABSOLUTE.  --absolute  process
	      images almost the	same as	--relative, but	additionally it	scales
	      all pixels by _max_lum_.

EXAMPLES
       pfsinppm	frame%04d.ppm --frames 0:10 | pfsview

	      Read  frames  from  files	 frame0000.ppm,	 frame0001.ppm,	  ...,
	      frame0010.ppm and	show them using	pfsview.

BUGS
       Please  report  bugs  and  comments on implementation to	the discussion
       group http://groups.google.com/group/pfstools

SEE ALSO
       pfsin(1), pfsout(1)

								   pfsinppm(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | BUGS | SEE ALSO

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