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pfsinppm(1) [debian man page]

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)

Check Out this Related Man Page

pfsinrgbe(1)						      General Commands Manual						      pfsinrgbe(1)

NAME

       pfsinrgbe - Load images or frames in Radiance RGBE format

SYNOPSIS

       pfsinrgbe [--linear] (<file> [--frames <range>] [--skip-missing])  [<file>...]

DESCRIPTION

       pfsinrgbe  command  loads  images  in Radiance RGBE format 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.

       Since RGBE is an HDR format, 'LUMINANCE' tag is set to 'RELATIVE' (relative linear 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. You can select the frames using the following options
       (the options must be always given after the file name):

       --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
	      Ignored for compatibility with pfsinppm.

EXAMPLES

       pfsinrgbe intro%d.hdr frame%d.hdr | ...

	      Concatenate two animations into one and pass it to pipe for further processing.

IMPORTANT NOTE

       There  is  an incompatibility between viewers of RGBE format in terms of absolute luminance values. The ximage viewer from Radiance package
       expects radiance values in RGBE files and uses the WHITE_EFFICACY constant equal to 179.0f to convert from radiance to luminance.  This	in
       practice  means that the values displayed with pfsview maybe higher than expected. To compensate for this incompatibility we suggest to use
       pfsabsolute command:

       pfsinrgbe measured_luminance.hdr | pfsabsolute 1 179 | pfsview

       This is not necessary when RGBE files are saved using pfsoutrgbe, Radiance package, mkhdr or Photospheare. This is also not  relevant  when
       only relative absolute values are considered.

BUGS

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

SEE ALSO

       pfsin(1), pfsout(1)

																      pfsinrgbe(1)
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