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falsecolor (1)
NAME
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falsecolor - make a false color RADIANCE picture |
SYNOPSIS
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falsecolor [ -i input ][ -p picture ][
-cb | -cl ][ -e ][ -s scale ][ -l
label ][ -n ndivs ][ -log decades ][ -m
mult ][ -r redv ][ -g grnv ][ -b
bluv ] |
DESCRIPTION
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Falsecolor produces a false color picture for
lighting analysis. Input is a rendered Radiance
picture. |
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By default, luminance is displayed on a linear scale from 0
to 1000 nits, where dark areas are blue and brighter areas
move through the spectrum to red. A different scale can be
given with the -s option. The default multiplier is
179, which converts from radiance or irradiance to luminance
or illuminance, respectively. A different multiplier can be
given with -m to get daylight factors or whatever.
For a logarithmic rather than a linear mapping, the
-log option can be used, where decades is the
number of decades below the maximum scale
desired. |
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A legend is produced for the new image with a label given by
the -l option. The default label is "Nits",
which is appropriate for standard Radiance images. If the
-i option of rpict(1) was used to produce the
image, then the appropriate label would be
"Lux". |
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If contour lines are desired rather than just false color,
the -cl option can be used. These lines can be placed
over another Radiance picture using the -p option. If
the input picture is given with -ip instead of
-i, then it will be used both as the source of values
and as the picture to overlay with contours. The -cb
option produces contour bands instead of lines, where the
thickness of the bands is related to the rate of change in
the image. The -n option can be used to change the
number of contours (and corresponding legend entries) from
the default value of 8. |
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The -e option causes extrema points to be printed on
the brightest and darkest pixels of the input
picture. |
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The remaining options, -r, -g, and -b are for
changing the mapping of values to colors. These are
expressions of the variable v, where v varies
from 0 to 1. These options are not recommended for the
casual user. |
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If no -i or -ip option is used, input is taken
from the standard input. The output image is always written
to standard output, which should be redirected. |
EXAMPLES
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To create a false color image directly from
rpict(1): |
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rpict -vf default.vp scene.oct | falsecolor >
scene.pic |
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To create a logarithmic contour plot of illuminance values
on a Radiance image: |
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rpict -i -vf default.vp scene.oct > irrad.pic
rpict -vf default.vp scene.oct > rad.pic
falsecolor -i irrad.pic -p rad.pic -cl -log 2 -l Lux >
lux.pic |
AUTHOR
ACKNOWLEDGEMENT
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Work on this program was initiated and sponsored by the LESO
group at EPFL in Switzerland. |
SEE ALSO
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