Snímek 5242
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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 18:22:23
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5242.pgm)
# Focal length : 7.5mm (35mm equivalent: 51mm)
# 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 4 12 13 -17 0.0184 0.0332 -0.0709 0.0280
10 93 110 111 39 0.428 0.294 0.163 0.341
50 544 537 537 165 2.50 1.43 0.688 1.80
90 1879 1877 1879 769 8.64 4.99 3.21 6.27
99 8144 9596 9598 3828 37.4 25.5 16.0 29.7
100 15869 15866 15866 15867 73.0 42.2 66.2 52.9
# flux from 0.378 sr ( 4.96E-7 sr/4px) is 1.19 lx ( 1.21 lx tilewise);
# tilewise luminance 3.15 cd/m2 with rel. SD 112 % (summing pixels below 15850)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 954.0 minimum= -104 maximum=15869 over 15850: 2023
# GrUp average= 966.1 minimum= -121 maximum=15866 over 15850: 2469
# GrDw average= 966.3 minimum= -108 maximum=15866 over 15850: 2470
# Blue average= 366.1 minimum= -128 maximum=15867 over 15850: 1330 zero: 1.5 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5242.txt -t 118 -s71:76 pgm/5242.pgm
Just points with luminances below 40 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:22:23
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5242.pgm)
# Focal length : 7.5mm (35mm equivalent: 51mm)
# 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 4 12 13 -17 0.0184 0.0332 -0.0709 0.0280
10 93 110 111 39 0.428 0.294 0.163 0.341
50 544 537 537 165 2.50 1.43 0.688 1.80
90 1879 1877 1879 769 8.64 4.99 3.21 6.27
99 8144 9596 9598 3828 37.4 25.5 16.0 29.7
100 15869 15866 15866 15867 73.0 42.2 66.2 52.9
# flux from 0.377 sr ( 4.96E-7 sr/4px) is 1.17 lx (points with luminances below 40 )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 940.3 minimum= -104 maximum=15869 over 15850: 2966
# GrUp average= 950.1 minimum= -121 maximum=15866 over 15850: 3412
# GrDw average= 950.5 minimum= -108 maximum=15866 over 15850: 3413
# Blue average= 359.5 minimum= -128 maximum=15867 over 15850: 2273 zero: 1.5 %
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -U40 -i 5242.txt -e 5242.eps -n 5242.ppm -t 118 -s71:76 pgm/5242.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.
