Snímek 5273
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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 20:19:20
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5273.pgm)
# Focal length : 19.2mm (35mm equivalent: 130mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# 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)* 0.00347
# % R G1 G2 B readings R G B L / cd/m2
1 -69 -65 -65 -67 -0.414 -0.226 -0.365 -0.292
10 -33 -30 -30 -32 -0.198 -0.104 -0.174 -0.137
50 0 0 0 0 0.00 0.00 0.00 0.00
90 42 42 43 41 0.252 0.148 0.223 0.184
99 91 107 107 87 0.546 0.371 0.474 0.433
100 15869 15866 15866 15867 95.3 55.1 86.5 69.2
# flux from 0.0580*0.57 sr ( 7.57E-8 sr/4px) is 0.00281 lx ( 0.00419 lx tilewise);
# tilewise luminance 0.0637 cd/m2 with rel. SD 539 % (summing pixels below 15850 and with non-zero green: there is 57.2 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= 15.1 minimum= -154 maximum=15869 over 15850: 69 zero: 40.3 %
# GrUp average= 24.5 minimum= -147 maximum=15866 over 15850: 87 zero: 43.3 %
# GrDw average= 24.2 minimum= -147 maximum=15866 over 15850: 85 zero: 42.4 %
# Blue average= 15.2 minimum= -139 maximum=15867 over 15850: 58 zero: 42.6 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5276.pgm -nh -nt -i 5273.txt -t 118 -s71:76 pgm/5273.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 20:19:20
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5273.pgm)
# Focal length : 19.2mm (35mm equivalent: 130mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# 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)* 0.00347
# % R G1 G2 B readings R G B L / cd/m2
1 -69 -65 -65 -67 -0.414 -0.226 -0.365 -0.292
10 -33 -30 -30 -32 -0.198 -0.104 -0.174 -0.137
50 0 0 0 0 0.00 0.00 0.00 0.00
90 42 42 43 41 0.252 0.148 0.223 0.184
99 91 107 107 87 0.546 0.371 0.474 0.433
100 15869 15866 15866 15867 95.3 55.1 86.5 69.2
# flux from 1.11E-4 sr ( 7.57E-8 sr/4px) is 0.00136 lx (points with luminances over 2.5 and below 40 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average=2320.6 minimum= -134 maximum=15869 over 15850: 764598
# GrUp average=3619.5 minimum= -147 maximum=15866 over 15850: 764616
# GrDw average=3554.6 minimum= -123 maximum=15866 over 15850: 764614
# Blue average=2270.1 minimum= -122 maximum=15867 over 15850: 764587
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L2.5 -U40 -i 5273.txt -e 5273.eps -n 5273.ppm -t 118 -s71:76 pgm/5273.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.
