Snímek 5235
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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 18:15:23
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5235.pgm)
# Focal length : 10.7mm (35mm equivalent: 72mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# 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)* 0.0415
# % R G1 G2 B readings R G B L / cd/m2
1 -68 -64 -65 -67 -4.89 -2.68 -4.37 -3.45
10 -32 -28 -29 -31 -2.30 -1.18 -2.02 -1.57
50 0 0 0 0 0.00 0.00 0.00 0.00
90 50 51 51 46 3.59 2.12 3.00 2.63
99 143 170 169 99 10.3 7.04 6.45 8.17
100 15869 15866 15866 15867 1.14E3 659 1.03E3 827
# flux from 0.186*0.61 sr ( 2.44E-7 sr/4px) is 0.125 lx ( 0.186 lx tilewise);
# tilewise luminance 0.895 cd/m2 with rel. SD 210 % (summing pixels below 15850 and with non-zero green: there is 61.4 % of them)
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red average= 19.3 minimum= -145 maximum=15869 over 15850: 165 zero: 36.7 %
# GrUp average= 24.6 minimum= -140 maximum=15866 over 15850: 155 zero: 38.8 %
# GrDw average= 23.9 minimum= -145 maximum=15866 over 15850: 158 zero: 38.4 %
# Blue average= 14.9 minimum= -176 maximum=15867 over 15850: 152 zero: 39.6 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5235.txt -t 118 -s71:76 pgm/5235.pgm
Just points with luminances over 40 and below 6.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:15:23
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5235.pgm)
# Focal length : 10.7mm (35mm equivalent: 72mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# 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)* 0.0415
# % R G1 G2 B readings R G B L / cd/m2
1 -68 -64 -65 -67 -4.89 -2.68 -4.37 -3.45
10 -32 -28 -29 -31 -2.30 -1.18 -2.02 -1.57
50 0 0 0 0 0.00 0.00 0.00 0.00
90 50 51 51 46 3.59 2.12 3.00 2.63
99 143 170 169 99 10.3 7.04 6.45 8.17
100 15869 15869 15869 15869 1.14E3 659 1.03E3 827
# flux from 2.75E-4 sr ( 2.44E-7 sr/4px) is 0.0319 lx (points with luminances over 40 and below 6.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red average=2406.4 minimum= -122 maximum=15869 over 15850: 764938
# GrUp average=2705.9 minimum= -126 maximum=15866 over 15850: 764928
# GrDw average=2639.9 minimum= -128 maximum=15866 over 15850: 764931
# Blue average=1876.4 minimum= -125 maximum=15867 over 15850: 764925
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -L40 -U600 -i 5235.txt -e 5235.eps -n 5235.ppm -t 118 -s71:76 pgm/5235.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.