pfsv(1) General Commands Manual pfsv(1)NAME
pfsv - Viewer for high-dynamic range images
SYNOPSIS
pfsv [files...]
DESCRIPTION
Display a HDR image or sequence of images using pfsview. This is a shell wrapper that invokes pfsin to load an image in one of the several
recognized formats (see pfsin for the list of formats) and displays it using pfsview.
Note: This program was renamed from pv to avoid conflict with the pipe viewer 'pv'.
EXAMPLES
pfsv memorial.hdr
Display memorial image.
SEE ALSO pfsview(1)pfsin(1)BUGS
Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de>.
pfsv(1)
Check Out this Related Man Page
pfsabsolute(1) General Commands Manual pfsabsolute(1)NAME
pfsabsolute - Convert luminance in images to absolute measure
SYNOPSIS
pfsabsolute <dest Y> [<src Y>] [--verbose] [--help]
DESCRIPTION
pfsabsolute applies all necessary operations to convert an image from relative luminance (tag LUMINANCE is RELATIVE) or display-dependent
luma (tag LUMINANCE is DISPLAY) to absolute luminance values. When the luminance in an image is absolute (tag LUMINANCE set to ABSOLUTE),
the Y channel represents physical luminance in cd/m^2. Absolute luminance levels are useful for some tone mapping algorithms and also for
image or video compression.
The argument <dest Y> denotes the level of luminance that relative luminance <src Y> should be rescaled to. The luminance is in fact multi-
plied by the ratio <dst Y>/<src Y>. <src Y> is normally relative luminance checked with pfsview in the spot where the absolute luminance
<dest Y> is measured, known or guessed. If <src Y> is omitted, the value 1 is assumed, so <dest Y> is just a scaling factor.
In case if display-depended luma (tag LUMINANCE is DISPLAY), the inverse gamma correction is applied (assuming sRGB color space). In such
case <dest Y> is usually the maximum luminance of a display (e.g. 80 cd/m^2).
This command always sets LUMINANCE tag to ABSOLUTE.
EXAMPLES
pfsin memorial.hdr | pfsabsolute 20 0.04 | pfsview
Multiply luminance in memorial image, so that relative luminance 0.04 becomes 20 cd/m^2. Normally, the value 0.04 is check using
pfsview in the spot, where the absolute luminance (which equals in this case 20 cd/m^2) is known.
pfsin lena.png | pfsabsolute 80 | pfsview
Convert lena image from sRGB color space to absolute XYZ, assuming maximum luminance of the monitor 80 cd/m^2.
SEE ALSO pfsgamma(1)pfsinppm(1)BUGS
Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de>.
pfsabsolute(1)