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pfsview(1)									       pfsview(1)

NAME
       pfsview - Viewer for high-dynamic range images in pfs format

SYNOPSIS
       pfsview [--window_min <log_lum>] [--window_max <log_lum>]

DESCRIPTION
       pfsview	is  a QT application for viewing high-dynamic range images. It expects pfs stream
       on the standard input and displays the frames in that stream one by one.

       pfsv script can be more convienent to use if hdr images are to be  displayed  without  any
       prior processing.

DYNAMIC RANGE WINDOW
       To  show high-dynamic range data on a low-dynamic range monitor, pfsview uses concept of a
       dynamic range window. The dynamic range window is the highest and lowest value that should
       be  mapped  to  black  and  white pixel. Values above or below the window are clipped (see
       clipping methods below). The dynamic range window is displayed in pfsview as a  blue  area
       on  the dynamic range scale (second toolbox from the top). The window can be moved, shrunk
       and expended using a mouse or a keyboard.

CLIPPING METHODS
       Currently, two clipping methods are available (see View menu):

       Simple clipping
	      The values above and below the dynamic range  window  are  displayed  as	black  or
	      white.

       Color-coded clipping
	      The  values  above  the  dynamic range window are displayed as yellow and below the
	      window as green. This is helpful to see which parts of the image do  not	fit  into
	      the selected dynamic range.

       Keep brightness and hue
	      This method tries to preserve brightness and hue while sacrificing color saturation
	      when the colors exceed the RGB color gamut. Colors are desaturated in the RGB color
	      space towards the neutral color (D65) of the corresponding luminance.

MAPPING METHODS
       High-dynamic  range data are usually better visualized using non-linear scale, for example
       a logarithmic or a power function. pfsview offers several such scales, shown in View menu.
       Gray-scale values for each mapping method are computed by the formulas:

       LINEAR: y = (x-min)/(max-min)

       GAMMA: y = [ (x-min)/(max-min) ]^gamma

       LOGARITHMIC: y = (log10(x)-log10(min))/(log10(max)-log10(min))

       where  y  is  the gray-scale value after mapping, x is an input HDR value, min and max are
       lower and upper bounds of the dynamic range window.

OPTIONS
       --window_min <log_lum>

	      Lower bound of the values that should be displayed or minimum value of the  dynamic
	      range  window.  The  value  should  be given in log_10 units, for example -1 if the
	      lower bound should be 0.1 (10^-1).

       --window_max <log_lum>
	      Upper bound of the values that should be displayed or minimum value of the  dynamic
	      range  window.  The  value  should  be given in log_10 units, for example -1 if the
	      upper bound should be 0.1 (10^-1).

EXAMPLES
       pfsin memorial.hdr | pfsview
	      See the memorial image.

       pfsv memorial.hdr
	      The same as above, but using the utility script 'pv'.

SEE ALSO
       pfsv(1) pfsin(1)

BUGS
       Zomming in may sometimes show artifacts.

       Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de>.

										       pfsview(1)
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