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pfstmo_fattal02(1)					    pfstmo_fattal02(1)

NAME
       pfstmo_fattal02 - Gradient domain high dynamic range compression

SYNOPSIS
       pfstmo_fattal02	[--alpha  <val>]  [--beta  <val>] [--saturation <val>]
       [--noise <val>] [--verbose] [--help]

DESCRIPTION
       This command implements a tone mapping operator as described in:

       Gradient Domain High Dynamic Range Compression R. Fattal,  D.  Lischin‐
       ski, and M. Werman In ACM Transactions on Graphics, 2002.

       With  respect  to  the original paper, this program provides additional
       parameter which limits the amplification of noise. The noise  is	 often
       starkly	amplified  because of division by zero in one of the equations
       in the paper. Extension contributed by Przemyslaw Bazarnik.

       Results of this TMO can be improved by using a gamma correction.

OPTIONS
       --alpha <val>, -a <val>

	      Set alpha parameter. <val> defines the threshold gradient	 value
	      (luminance differents of adjacent pixels) below which the gradi‐
	      ents are amplified (detail enhancement) and above which the gra‐
	      dients are attenuated (global contrast reduction).
	       Suggested  range	 is  1	to  0.0001. It is reasonable to change
	      parameters by orders of magnitude, so for instance  trying  0.1,
	      0.01, 0.001 etc.	(see paper for details).

       --beta <val>, -b <val>

	      Set  beta	 parameter. <val> sets the strength of gradient (local
	      contrast) modification.  Suggested range is  0.8	to  0.96  (see
	      paper  for details).  Value of 1 does not change contrasts, val‐
	      ues above 1 reverse the effect: global contrast is stretched and
	      details  are  attenuated.	  Values below 0.5 lead to very strong
	      amplification of	small  contrast,  so  consider	using  --noise
	      parameter close to 'alpha' value to prevent noise.

       --saturation <val>, -s <val>

	      Amount  of  color	 saturation.  Suggested	 range	is 0.4 to 0.8.
	      Default value: 0.6.

       --noise <val>, -n <val>

	      Reduces gradient amplification value for gradients  close	 to  0
	      and  reduces  noise  in the result. <val> defines gradient value
	      (luminance differents of adjacent pixels) which  is  treated  as
	      noise.  Suggested	 range	is  0.0 to the value of alpha. Default
	      value calculated based on alpha: 0.001*alpha.

       --verbose

	      Print additional information during program execution.

       --help

	      Print list of command line options.

EXAMPLES
       pfsin memorial.hdr | pfstmo_fattal02 -v |  pfsgamma  -g	2.2  |	pfsout
       memorial.png

	      Tone map image and save it in png format.

SEE ALSO
       pfsin(1) pfsout(1) pfsview(1)

BUGS
       Please  report bugs and comments on implementation to Grzegorz Krawczyk
       <krawczyk@mpi-sb.mpg.de>.

							    pfstmo_fattal02(1)

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