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Pamtopfm User Manual(0) 						  Pamtopfm User Manual(0)

       pamtopfm - Convert Netpbm image to PFM (Portable Float Map)

       pamtopfm [-endian={big|little}] [-scale=float] [imagefile]

       All  options  can be abbreviated to their shortest unique prefix.  You may use two hyphens
       instead of one.	You may separate an option name and its value with white space instead of
       an equals sign.

       This program is part of Netpbm(1)

       pamtopfm  reads	a Netpbm image (PNM or PAM) and converts it to a PFM (Portable Float Map)

       The PFM (Portable Float Map) image format is a lot like PPM, but uses floating point  num-
       bers  with  no maxval to achieve a High Dynamic Range (HDR) format.  That means it doesn't
       have a concept of absolute color and it can represent generic light intensity  information
       rather  than  just  visual information like PPM does.  For example, two pixels that are so
       close in intensity that the human eye cannot tell them apart are not visually distinct, so
       a  visual image format such as PPM would have no reason to use different sample values for
       them.  But an HDR format would.

       There are details of the PFM format in the PFM Format Description (1)

       USC's HDRShop program <http://www.debevec.org/HDRShop>  and a program called Lefty use it.

       pamtopfm creates a color PFM image if its input is RGB (PPM) and a  non-color  PFM  other-

       Use pfmtopam(1)
	to convert a PFM image to Netpbm format.


	      This specifies the scale factor of the PFM image.
		   Scale factor is a component of the PFM format.
		   Default is 1.0.


	      This specifies the endianness of the PFM image.  The samples
		   in the raster of a PFM image are 4 byte IEEE floating point
		   numbers.  A parameter of the IEEE format, and therefore the PFM
		   format, is endianness, i.e. whether the specified bytes are
		   ordered from low addresses to high addresses or vice versa.

	      big means big endian -- the natural ordering;
		   little means little-endian, the Intel-friendly ordering.

	      Default is whichever endianness the machine on which pamtopfm
		   runs uses internally, which results in the faster execution.

       Netpbm(1) , pfmtopam(1) , pam(1)

       pamtopfm was added to Netpbm in Release 10.22 (April 2004).

netpbm documentation			  10 April 2004 		  Pamtopfm User Manual(0)
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