This is the command phisto that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
phisto - compute a luminance histogram from one or more RADIANCE pictures
SYNOPSIS
phisto picture ..
DESCRIPTION
Phisto is a script that calls pfilt(1), rcalc(1) and histo(1) to compute a histogram of
log luminance values for foveal samples in the given picture files. A foveal sample
covers approximately 1 degree, though this script does not use this exact area. The
minimum and maximum values are determined, and 100 histogram bins are uniformly divided
between these extrema. Foveal samples less than 1e-7 candelas/sq.meter are silently
ignored. If no picture is named on the command line, the standard input is read.
The primary function of this script is to precompute histograms for the pcond(1) program,
which may then be used to compute multiple, identical exposures. This is especially
useful for animations and image comparisons.
EXAMPLE
To compute two identical tone mappings for image1.hdr and image2.hdr:
phisto image1.hdr image2.hdr > both.histo
pcond -I -h image1.hdr < both.histo > image1m.hdr
pcond -I -h image2.hdr < both.histo > image2m.hdr
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