Snímek 5138
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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 : 2006:02:24 20:24:27
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5138.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# 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 -69 -64 -64 -67 -0.317 -0.170 -0.280 -0.222
10 -31 -27 -27 -30 -0.143 -0.0718 -0.125 -0.0965
50 2 4 5 1 0.00920 0.0120 0.00417 0.0110
90 65 72 73 61 0.299 0.193 0.255 0.230
99 1344 1990 1987 929 6.18 5.28 3.88 5.60
100 16349 16371 16383 16383 75.2 43.5 68.4 54.6
# flux from 0.654*0.66 sr ( 8.59E-7 sr/4px) is 0.140 lx ( 0.158 lx tilewise);
# tilewise luminance 0.216 cd/m2 with rel. SD 331 % (summing pixels below 15850 and with non-zero green: there is 65.8 % of them)
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red average= 80.1 minimum= -155 maximum=16349 over 15850: 150 zero: 33.8 %
# GrUp average= 119.4 minimum= -140 maximum=16371 over 15850: 186 zero: 34.7 %
# GrDw average= 118.6 minimum= -162 maximum=16383 over 15850: 192 zero: 33.8 %
# Blue average= 61.1 minimum= -144 maximum=16383 over 15850: 174 zero: 36.2 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5154.pgm -nh -nt -i 5138.txt -t 118 -s71:76 pgm/5138.pgm
Just points with luminances over 1.0 and below 25 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 20:24:27
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5138.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# 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 -69 -64 -64 -67 -0.317 -0.170 -0.280 -0.222
10 -31 -27 -27 -30 -0.143 -0.0718 -0.125 -0.0965
50 2 4 5 1 0.00920 0.0120 0.00417 0.0110
90 65 72 73 61 0.299 0.193 0.255 0.230
99 1345 1992 1988 930 6.18 5.29 3.88 5.60
100 16383 16383 16383 16383 75.3 43.5 68.4 54.7
# flux from 0.0227 sr ( 8.59E-7 sr/4px) is 0.102 lx (points with luminances over 1.0 and below 25 )
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red average=1122.7 minimum= -137 maximum=16349 over 15850: 739565
# GrUp average=1645.9 minimum= -135 maximum=16371 over 15850: 739601
# GrDw average=1645.8 minimum= -118 maximum=16383 over 15850: 739607
# Blue average= 797.1 minimum= -132 maximum=16383 over 15850: 739589
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5154.pgm -sm100 -nh -L1 -U25 -i 5138.txt -e 5138.eps -n 5138.ppm -t 118 -s71:76 pgm/5138.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.
