pfsglview - Man Page

Viewer for high-dynamic range images in pfs format


pfsglview [--h] [--v]


pfsview is a OpenGL/GLUT 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, pfsglview 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 pfsglview 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.

Zooming and Panning

To zoom image, the mouse can be dragged in vertical direction with the left button pressed.  Pressing [space] button or pressing left mouse button above the statistic window (left-bottom corner) changes from  zooming to panning modes and vice versa. To pan image, the mouse can be dragged in vertical  and horizontal directions with the left button pressed.

Mapping Methods

High-dynamic range data are usually better visualized using non-linear scale, for example a logarithmic or a power function. pfsglview offers several such scales, shown in popup 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.


pfsin memorial.hdr | pfsglview

See the memorial image.

pfsin memorial.hdr | pfsglview | pfsout memorial.jpg

See the memorial image and save the clipped (8-bits) version to memorial.jpg (Save&Quit option from popup menu should be activated).

See Also


Please report bugs and comments to Radoslaw Mantiuk <>.

Referenced By