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
       information 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 values (0-255) are scaled to 0-1 before storing them in pfs stream. Sim-
       ilarly, 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 transformation 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 proceedings 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 missing. 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 generated.

       --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 RELATIVE.

       --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 lumi-
	      nance 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)