Snímek 5241
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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 18:22:14
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5241.pgm)
# Focal length : 7.5mm (35mm equivalent: 51mm)
# 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 -60 -56 -56 -63 -4.31 -2.33 -4.11 -3.02
10 -20 -16 -17 -25 -1.44 -0.685 -1.63 -0.948
50 26 27 27 10 1.87 1.12 0.652 1.38
90 118 125 125 73 8.48 5.19 4.76 6.34
99 523 626 629 255 37.6 26.1 16.6 30.1
100 15869 15866 15866 15867 1.14E3 659 1.03E3 827
# flux from 0.379*0.80 sr ( 4.96E-7 sr/4px) is 1.07 lx ( 1.30 lx tilewise);
# tilewise luminance 3.27 cd/m2 with rel. SD 140 % (summing pixels below 15850 and with non-zero green: there is 80.1 % of them)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 66.1 minimum= -142 maximum=15869 over 15850: 424 zero: 19.4 %
# GrUp average= 73.9 minimum= -136 maximum=15866 over 15850: 430 zero: 20.2 %
# GrDw average= 74.0 minimum= -152 maximum=15866 over 15850: 407 zero: 19.6 %
# Blue average= 39.0 minimum= -178 maximum=15867 over 15850: 366 zero: 28.1 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5241.txt -t 118 -s71:76 pgm/5241.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 18:22:14
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5241.pgm)
# Focal length : 7.5mm (35mm equivalent: 51mm)
# 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 -60 -56 -56 -63 -4.31 -2.33 -4.11 -3.02
10 -20 -16 -17 -25 -1.44 -0.685 -1.63 -0.948
50 26 27 27 10 1.87 1.12 0.652 1.38
90 118 125 125 73 8.48 5.19 4.76 6.34
99 523 626 629 255 37.6 26.1 16.6 30.1
100 15869 15866 15869 15869 1.14E3 659 1.03E3 827
# flux from 0.00161 sr ( 4.96E-7 sr/4px) is 0.146 lx (points with luminances over 40 and below 6.0E2 )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average=1989.6 minimum= -112 maximum=15869 over 15850: 762696
# GrUp average=2153.0 minimum= -112 maximum=15866 over 15850: 762702
# GrDw average=2222.0 minimum= -101 maximum=15866 over 15850: 762679
# Blue average=1642.4 minimum= -144 maximum=15867 over 15850: 762638
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -L40 -U600 -i 5241.txt -e 5241.eps -n 5241.ppm -t 118 -s71:76 pgm/5241.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.
