table of contents
other versions
- wheezy 1.8.5-1
- jessie 1.8.5-2+b1
- testing 2.0.5-2+b2
- unstable 2.0.5-2+b2
- experimental 2.0.6-1
pfsview(1) | General Commands Manual | pfsview(1) |
NAME¶
pfsview - Viewer for high-dynamic range images in pfs formatSYNOPSIS¶
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.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:OPTIONS¶
- --window_min <log_lum>
-
- --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'.