Snímek 5137
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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 : 2006:02:24 20:24:03
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5137.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 -71 -67 -68 -69 -5.10 -2.80 -4.50 -3.61
10 -35 -32 -33 -34 -2.51 -1.35 -2.22 -1.76
50 0 0 0 0 0.00 0.00 0.00 0.00
90 40 38 39 38 2.87 1.60 2.48 2.04
99 94 119 120 85 6.75 4.96 5.54 5.59
100 16365 16379 15912 15906 1.18E3 670 1.04E3 847
# flux from 0.654*0.52 sr ( 8.59E-7 sr/4px) is 0.134 lx ( 0.227 lx tilewise);
# tilewise luminance 0.311 cd/m2 with rel. SD 318 % (summing pixels below 15850 and with non-zero green: there is 51.9 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average= 6.2 minimum= -146 maximum=16365 over 15850: 31 zero: 44.1 %
# GrUp average= 9.6 minimum= -141 maximum=16379 over 15850: 36 zero: 48.3 %
# GrDw average= 9.2 minimum= -146 maximum=15912 over 15850: 35 zero: 47.9 %
# Blue average= 5.3 minimum= -143 maximum=15906 over 15850: 34 zero: 46.4 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5137.txt -t 118 -s71:76 pgm/5137.pgm
Just points with luminances over 25 and below 5.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 20:24:03
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5137.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 -71 -67 -68 -69 -5.10 -2.80 -4.50 -3.61
10 -35 -32 -33 -34 -2.51 -1.35 -2.22 -1.76
50 0 0 0 0 0.00 0.00 0.00 0.00
90 40 38 39 38 2.87 1.60 2.48 2.04
99 94 119 120 85 6.75 4.96 5.54 5.59
100 16379 16379 16379 16379 1.18E3 680 1.07E3 854
# flux from 5.40E-4 sr ( 8.59E-7 sr/4px) is 0.0274 lx (points with luminances over 25 and below 5.0E2 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average=1128.5 minimum= -137 maximum=16365 over 15850: 765448
# GrUp average=1283.1 minimum= -132 maximum=16379 over 15850: 765453
# GrDw average=1349.6 minimum= -141 maximum=15912 over 15850: 765452
# Blue average=1068.9 minimum= -136 maximum=15906 over 15850: 765451
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L25 -U500 -i 5137.txt -e 5137.eps -n 5137.ppm -t 118 -s71:76 pgm/5137.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.