Snímek 5245
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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 18:33:20
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5245.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# 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 -65 -60 -61 -65 -4.67 -2.51 -4.24 -3.27
10 -27 -22 -23 -28 -1.94 -0.934 -1.83 -1.29
50 14 17 17 8 1.01 0.706 0.522 0.811
90 120 146 146 77 8.62 6.06 5.02 6.96
99 527 618 616 254 37.9 25.6 16.6 29.9
100 15977 15974 15974 15975 1.15E3 663 1.04E3 833
# flux from 0.654*0.74 sr ( 8.59E-7 sr/4px) is 1.68 lx ( 2.02 lx tilewise);
# tilewise luminance 2.91 cd/m2 with rel. SD 158 % (summing pixels below 15850 and with non-zero green: there is 73.6 % of them)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 62.4 minimum= -163 maximum=15977 over 15850: 315 zero: 26.1 %
# GrUp average= 76.8 minimum= -135 maximum=15974 over 15850: 298 zero: 26.4 %
# GrDw average= 76.3 minimum= -152 maximum=15974 over 15850: 301 zero: 26.3 %
# Blue average= 38.0 minimum= -164 maximum=15975 over 15850: 207 zero: 30.6 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5245.txt -t 118 -s71:76 pgm/5245.pgm
Just points with luminances over 40 and below 3.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:33:20
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5245.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# 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 -65 -60 -61 -65 -4.67 -2.51 -4.24 -3.27
10 -27 -22 -23 -28 -1.94 -0.934 -1.83 -1.29
50 14 17 17 8 1.01 0.706 0.522 0.811
90 120 146 146 77 8.62 6.06 5.02 6.96
99 527 618 616 254 37.9 25.6 16.6 29.9
100 15977 15974 15977 15977 1.15E3 663 1.04E3 833
# flux from 0.00269 sr ( 8.59E-7 sr/4px) is 0.209 lx (points with luminances over 40 and below 3.0E2 )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average=1688.2 minimum= -140 maximum=15977 over 15850: 762845
# GrUp average=1861.5 minimum= -135 maximum=15974 over 15850: 762828
# GrDw average=1893.2 minimum= -120 maximum=15974 over 15850: 762831
# Blue average=1249.3 minimum= -132 maximum=15975 over 15850: 762737
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -L40 -U300 -i 5245.txt -e 5245.eps -n 5245.ppm -t 118 -s71:76 pgm/5245.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.
