Snímek 5263
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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 19:49:33
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5263.pgm)
# Focal length : 15.4mm (35mm equivalent: 104mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# Aperture : f/3.2
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.0542
# % R G1 G2 B readings R G B L / cd/m2
1 -70 -67 -66 -68 -6.57 -3.61 -5.79 -4.64
10 -35 -32 -32 -33 -3.28 -1.74 -2.81 -2.28
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 3.28 1.76 2.90 2.30
99 71 67 68 69 6.66 3.66 5.88 4.71
100 1768 3262 2791 6273 166 164 534 165
# flux from 0.0901*0.49 sr ( 1.18E-7 sr/4px) is 0.00136 lx ( 0.00260 lx tilewise);
# tilewise luminance 0.0264 cd/m2 with rel. SD 719 % (summing pixels below 15850 and with non-zero green: there is 48.6 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= 0.3 minimum= -150 maximum= 1768 over 15850: 0 zero: 46.0 %
# GrUp average= 0.3 minimum= -153 maximum= 3262 over 15850: 0 zero: 52.0 %
# GrDw average= 0.8 minimum= -147 maximum= 2791 over 15850: 0 zero: 50.8 %
# Blue average= 0.3 minimum= -143 maximum= 6273 over 15850: 0 zero: 48.6 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5276.pgm -nh -nt -i 5263.txt -t 118 -s71:76 pgm/5263.pgm
Just points with luminances over 40 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 19:49:33
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5263.pgm)
# Focal length : 15.4mm (35mm equivalent: 104mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# Aperture : f/3.2
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.0542
# % R G1 G2 B readings R G B L / cd/m2
1 -70 -67 -66 -68 -6.57 -3.61 -5.79 -4.64
10 -35 -32 -32 -33 -3.28 -1.74 -2.81 -2.28
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 3.28 1.76 2.90 2.30
99 71 67 68 69 6.66 3.66 5.88 4.71
100 1768 3262 2791 6273 166 164 534 165
# flux from 9.18E-6 sr ( 1.18E-7 sr/4px) is 6.70E-4 lx ( 6.77E-4 lx tilewise);
# tilewise luminance 1.65 cd/m2 with rel. SD 663 % (points with luminances over 40 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= 853.1 minimum= -150 maximum= 1768 out of range: 766034
# GrUp average=1332.2 minimum= -153 maximum= 3262 out of range: 766034
# GrDw average=1239.1 minimum= -147 maximum= 2791 out of range: 766034
# Blue average= 709.9 minimum= -143 maximum= 6273 out of range: 766034
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L40 -i 5263.txt -e 5263.eps -n 5263.ppm -t 118 -s71:76 pgm/5263.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.
