Snímek 5236
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| | původní | zesvětlený | barevně kódovaný
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a ještě s vloženou mřížkou s údaji:
(údaj uprostřed políček mřížky je medián surových hodnot
zelených pixelů, údaj dole je jas políčka
dělený jednou kandelou na metr čtvereční).
# Date/Time : 2006:02:26 18:15:33
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5236.pgm)
# Focal length : 10.7mm (35mm equivalent: 72mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# Aperture : f/2.8
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.00266
# % R G1 G2 B readings R G B L / cd/m2
1 -44 -36 -38 -44 -0.202 -0.0983 -0.184 -0.135
10 0 9 7 0 0.00 0.0213 0.00 0.0138
50 82 118 119 84 0.377 0.315 0.350 0.337
90 331 406 407 216 1.52 1.08 0.901 1.23
99 2395 2785 2792 1184 11.0 7.41 4.94 8.67
100 15869 15866 15866 15867 73.0 42.2 66.2 52.9
# flux from 0.186*0.95 sr ( 2.44E-7 sr/4px) is 0.129 lx ( 0.139 lx tilewise);
# tilewise luminance 0.678 cd/m2 with rel. SD 169 % (summing pixels below 15850 and with non-zero green: there is 94.9 % of them)
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red average= 200.8 minimum= -144 maximum=15869 over 15850: 1006 zero: 6.1 %
# GrUp average= 247.4 minimum= -135 maximum=15866 over 15850: 1131 zero: 5.0 %
# GrDw average= 248.0 minimum= -132 maximum=15866 over 15850: 1122 zero: 5.2 %
# Blue average= 139.9 minimum= -138 maximum=15867 over 15850: 680 zero: 6.8 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5236.txt -t 118 -s71:76 pgm/5236.pgm
Just points with luminances over 2.5 and below 40 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:15:33
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5236.pgm)
# Focal length : 10.7mm (35mm equivalent: 72mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# Aperture : f/2.8
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.00266
# % R G1 G2 B readings R G B L / cd/m2
1 -44 -36 -38 -44 -0.202 -0.0983 -0.184 -0.135
10 0 9 7 0 0.00 0.0213 0.00 0.0138
50 82 118 119 84 0.377 0.315 0.350 0.337
90 331 406 407 216 1.52 1.08 0.901 1.23
99 2396 2785 2792 1184 11.0 7.41 4.94 8.67
100 15869 15866 15866 15869 73.0 42.2 66.2 52.9
# flux from 0.00863 sr ( 2.44E-7 sr/4px) is 0.0543 lx (points with luminances over 2.5 and below 40 )
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red average=1836.6 minimum= -137 maximum=15869 over 15850: 730406
# GrUp average=2080.0 minimum= -125 maximum=15866 over 15850: 730531
# GrDw average=2079.2 minimum= -128 maximum=15866 over 15850: 730522
# Blue average= 999.8 minimum= -119 maximum=15867 over 15850: 730080
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -L2.5 -U40 -i 5236.txt -e 5236.eps -n 5236.ppm -t 118 -s71:76 pgm/5236.pgm
Logaritmická škála jasů (jednotkou je kandela na metr čtvereční,
nazývaná též nit) – intenzity osvětlení sněhu v luxech dostanete
vynásobením jasu v nitech koeficientem 3,6. U intenzit osvětlení
lesní stěny je takový koeficient 20 až 40.
