Snímek 5239
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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 18:21:48
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5239.pgm)
# Focal length : 7.5mm (35mm equivalent: 51mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.664
# % R G1 G2 B readings R G B L / cd/m2
1 -70 -66 -67 -69 -80.5 -44.2 -72.0 -56.9
10 -34 -31 -32 -33 -39.1 -20.9 -34.4 -27.3
50 0 0 0 0 0.00 0.00 0.00 0.00
90 39 37 38 37 44.8 24.9 38.6 31.9
99 79 78 79 75 90.8 52.2 78.2 65.7
100 15869 15866 15866 15867 1.82E4 1.05E4 1.66E4 1.32E4
# flux from 0.379*0.52 sr ( 4.96E-7 sr/4px) is 1.62 lx ( 3.14 lx tilewise);
# tilewise luminance 7.42 cd/m2 with rel. SD 309 % (summing pixels below 15850 and with non-zero green: there is 52.4 % of them)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 9.9 minimum= -149 maximum=15869 over 15850: 66 zero: 43.2 %
# GrUp average= 11.4 minimum= -140 maximum=15866 over 15850: 90 zero: 47.9 %
# GrDw average= 11.5 minimum= -145 maximum=15866 over 15850: 76 zero: 47.3 %
# Blue average= 6.7 minimum= -153 maximum=15867 over 15850: 6 zero: 46.5 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5239.txt -t 118 -s71:76 pgm/5239.pgm
Just points with luminances over 6.0E2 and below 5.0E3 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:21:48
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5239.pgm)
# Focal length : 7.5mm (35mm equivalent: 51mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.664
# % R G1 G2 B readings R G B L / cd/m2
1 -70 -66 -67 -69 -80.5 -44.2 -72.0 -56.9
10 -34 -31 -32 -33 -39.1 -20.9 -34.4 -27.3
50 0 0 0 0 0.00 0.00 0.00 0.00
90 39 37 38 37 44.8 24.9 38.6 31.9
99 79 78 79 75 90.8 52.2 78.2 65.7
100 15869 15866 15866 15867 1.82E4 1.05E4 1.66E4 1.32E4
# flux from 2.79E-4 sr ( 4.96E-7 sr/4px) is 0.523 lx (points with luminances over 6.0E2 and below 5.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average=2942.6 minimum= -125 maximum=15869 over 15850: 765495
# GrUp average=2731.7 minimum= -137 maximum=15866 over 15850: 765519
# GrDw average=3076.7 minimum= -118 maximum=15866 over 15850: 765505
# Blue average=1961.1 minimum= -153 maximum=15867 over 15850: 765435
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -L600 -U5000 -i 5239.txt -e 5239.eps -n 5239.ppm -t 118 -s71:76 pgm/5239.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.