Snímek 5301
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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 21:04:36
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5301.pgm)
# Focal length : 40.5mm (35mm equivalent: 274mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# Aperture : f/3.2
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.0542
# % R G1 G2 B readings R G B L / cd/m2
1 -69 -65 -65 -67 -6.47 -3.53 -5.71 -4.56
10 -33 -29 -30 -32 -3.10 -1.60 -2.72 -2.12
50 0 0 0 0 0.00 0.00 0.00 0.00
90 49 52 52 47 4.60 2.82 4.00 3.44
99 248 395 394 226 23.3 21.4 19.2 22.1
100 15313 15866 15820 7218 1.44E3 859 615 1.06E3
# flux from 0.0130*0.56 sr ( 1.70E-8 sr/4px) is 0.0119 lx ( 0.0154 lx tilewise);
# tilewise luminance 1.03 cd/m2 with rel. SD 289 % (summing pixels below 15850 and with non-zero green: there is 56.0 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= 17.3 minimum= -152 maximum=15313 over 15850: 0 zero: 40.8 %
# GrUp average= 29.8 minimum= -134 maximum=15866 over 15850: 2 zero: 44.2 %
# GrDw average= 29.2 minimum= -143 maximum=15820 over 15850: 1 zero: 43.8 %
# Blue average= 16.3 minimum= -143 maximum= 7218 over 15850: 0 zero: 43.0 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5276.pgm -nh -nt -i 5301.txt -t 118 -s71:76 pgm/5301.pgm
Just points with luminances over 60 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 21:04:36
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5301.pgm)
# Focal length : 40.5mm (35mm equivalent: 274mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# Aperture : f/3.2
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.0542
# % R G1 G2 B readings R G B L / cd/m2
1 -69 -65 -65 -67 -6.47 -3.53 -5.71 -4.56
10 -33 -29 -30 -32 -3.10 -1.60 -2.72 -2.12
50 0 0 0 0 0.00 0.00 0.00 0.00
90 49 52 52 47 4.60 2.82 4.00 3.44
99 248 395 394 226 23.3 21.4 19.2 22.1
100 15866 15866 15820 7218 1.49E3 859 615 1.08E3
# flux from 1.80E-6 sr ( 1.70E-8 sr/4px) is 2.68E-4 lx (points with luminances over 60 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average=1757.1 minimum= -132 maximum=15313 over 15850: 766003
# GrUp average=2885.8 minimum= -120 maximum=15866 over 15850: 766005
# GrDw average=2492.7 minimum= -131 maximum=15820 over 15850: 766004
# Blue average=1164.5 minimum= -143 maximum= 7218 over 15850: 766003
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L60 -i 5301.txt -e 5301.eps -n 5301.ppm -t 118 -s71:76 pgm/5301.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.
