lum(9) [plan9 man page]
LUM(9.1) LUM(9.1) NAME
lum - compute luminance SYNOPSIS
fb/lum [ input ] DESCRIPTION
Lum computes the luminance of the input picture using the NTSC formula L=.299R+.587G+.114B. Pixel values are mapped through the input image's color map, if any. The resulting image is written to standard output. SOURCE
/sys/src/fb/lum.c SEE ALSO
picfile(9.6) LUM(9.1)
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dcod2lum(1) OFFIS DCMTK dcod2lum(1) NAME
dcod2lum - Convert hardcopy characteristic curve file to softcopy format SYNOPSIS
dcod2lum in-file out-file DESCRIPTION
Command line program that converts a hardcopy characteristic curve file to softcopy format. In other words, the measured optical density (OD) values from the input file are transformed to the luminance space according to the formula: L = La + L0 * 10^(-D) where L is the resulting luminance, La is the reflected ambient light and L0 the illumination (both measured in cd/m^2), 'D' the optical density (OD). Please note that if no illumination value is specified in the input file (keyword lum) all optical density values are mapped to a constant luminance. PARAMETERS
in-file hardcopy characteristic curve file to be converted out-file softcopy characteristic curve file to be written NOTES
The format of both input and ouput file is described the documentation of the dcmdspfn command line tool. In addition, the data folder contains sample characteristics file monitors, cameras, printers and scanners. FILES
<datadir>/camera.lut - sample characteristics file of a camera <datadir>/monitor.lut - sample characteristics file of a monitor <datadir>/printer.lut - sample characteristics file of a printer <datadir>/scanner.lut - sample characteristics file of a scanner SEE ALSO
dcmdspfn(1) COPYRIGHT
Copyright (C) 2002-2010 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany. Version 3.6.0 6 Jan 2011 dcod2lum(1)