Snímek 5147
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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 20:36:04
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5147.pgm)
# Focal length : 12.0mm (35mm equivalent: 81mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# 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)* 0.00266
# % R G1 G2 B readings R G B L / cd/m2
1 -68 -64 -64 -67 -0.313 -0.170 -0.280 -0.220
10 -30 -26 -26 -29 -0.138 -0.0691 -0.121 -0.0932
50 5 8 9 4 0.0230 0.0226 0.0167 0.0227
90 77 97 99 71 0.354 0.260 0.296 0.293
99 1382 2092 2110 1024 6.35 5.58 4.27 5.85
100 15869 15866 15866 15867 73.0 42.2 66.2 52.9
# flux from 0.148*0.69 sr ( 1.94E-7 sr/4px) is 0.0380 lx ( 0.0425 lx tilewise);
# tilewise luminance 0.251 cd/m2 with rel. SD 312 % (summing pixels below 15850 and with non-zero green: there is 69.2 % of them)
# Fuji Devignetting: 2 # dark frame dark/5154.pgm subtracted from all values
# Red average= 89.0 minimum= -162 maximum=15869 over 15850: 125 zero: 31.2 %
# GrUp average= 136.8 minimum= -140 maximum=15866 over 15850: 167 zero: 31.3 %
# GrDw average= 135.9 minimum= -145 maximum=15866 over 15850: 171 zero: 30.4 %
# Blue average= 70.0 minimum= -141 maximum=15867 over 15850: 200 zero: 33.2 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5154.pgm -nh -nt -i 5147.txt -t 118 -s71:76 pgm/5147.pgm
Just points with luminances over 1.0 and below 25 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 20:36:04
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5147.pgm)
# Focal length : 12.0mm (35mm equivalent: 81mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# 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)* 0.00266
# % R G1 G2 B readings R G B L / cd/m2
1 -68 -64 -64 -67 -0.313 -0.170 -0.280 -0.220
10 -30 -26 -26 -29 -0.138 -0.0691 -0.121 -0.0932
50 5 8 9 4 0.0230 0.0226 0.0167 0.0227
90 77 97 99 71 0.354 0.260 0.296 0.293
99 1383 2092 2111 1024 6.36 5.59 4.27 5.86
100 15869 15869 15869 15869 73.0 42.2 66.2 52.9
# flux from 0.00737 sr ( 1.94E-7 sr/4px) is 0.0295 lx (points with luminances over 1.0 and below 25 )
# Fuji Devignetting: 2 # dark frame dark/5154.pgm subtracted from all values
# Red average= 961.3 minimum= -139 maximum=15869 over 15850: 727947
# GrUp average=1467.2 minimum= -120 maximum=15866 over 15850: 727989
# GrDw average=1468.4 minimum= -120 maximum=15866 over 15850: 727993
# Blue average= 708.3 minimum= -119 maximum=15867 over 15850: 728022
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5154.pgm -sm100 -nh -L1 -U25 -i 5147.txt -e 5147.eps -n 5147.ppm -t 118 -s71:76 pgm/5147.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.
