Snímek 5283
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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 20:24:53
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5283.pgm)
# Focal length : 19.2mm (35mm equivalent: 130mm)
# 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 -70 -66 -66 -68 -6.57 -3.58 -5.79 -4.63
10 -35 -31 -32 -33 -3.28 -1.71 -2.81 -2.26
50 0 0 0 0 0.00 0.00 0.00 0.00
90 36 33 34 35 3.38 1.82 2.98 2.36
99 73 71 72 71 6.85 3.88 6.05 4.92
100 15869 15866 15866 15867 1.49E3 861 1.35E3 1.08E3
# flux from 0.0580*0.50 sr ( 7.57E-8 sr/4px) is 0.00555 lx ( 0.0118 lx tilewise);
# tilewise luminance 0.186 cd/m2 with rel. SD 467 % (summing pixels below 15850 and with non-zero green: there is 49.6 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= 2.7 minimum= -154 maximum=15869 over 15850: 26 zero: 45.5 %
# GrUp average= 3.7 minimum= -144 maximum=15866 over 15850: 40 zero: 50.9 %
# GrDw average= 3.6 minimum= -143 maximum=15866 over 15850: 44 zero: 49.8 %
# Blue average= 2.2 minimum= -141 maximum=15867 over 15850: 18 zero: 48.0 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5276.pgm -nh -nt -i 5283.txt -t 118 -s71:76 pgm/5283.pgm
Just points with luminances over 30 and below 5.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 20:24:53
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5283.pgm)
# Focal length : 19.2mm (35mm equivalent: 130mm)
# 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 -70 -66 -66 -68 -6.57 -3.58 -5.79 -4.63
10 -35 -31 -32 -33 -3.28 -1.71 -2.81 -2.26
50 0 0 0 0 0.00 0.00 0.00 0.00
90 36 33 34 35 3.38 1.82 2.98 2.36
99 73 71 72 71 6.85 3.88 6.05 4.92
100 15869 15869 15869 15869 1.49E3 861 1.35E3 1.08E3
# flux from 1.28E-5 sr ( 7.57E-8 sr/4px) is 0.00183 lx (points with luminances over 30 and below 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average=2651.5 minimum= -122 maximum=15869 over 15850: 765914
# GrUp average=3234.6 minimum= -124 maximum=15866 over 15850: 765928
# GrDw average=2902.1 minimum= -131 maximum=15866 over 15850: 765932
# Blue average=1744.7 minimum= -140 maximum=15867 over 15850: 765906
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L30 -U500 -i 5283.txt -e 5283.eps -n 5283.ppm -t 118 -s71:76 pgm/5283.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.
