Snímek 5282
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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 20:24:38
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5282.pgm)
# Focal length : 19.2mm (35mm equivalent: 130mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.868
# % R G1 G2 B readings R G B L / cd/m2
1 -70 -67 -67 -68 -105 -58.1 -92.6 -74.6
10 -35 -32 -32 -34 -52.5 -27.8 -46.3 -36.4
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 32 33 52.5 27.8 45.0 36.4
99 70 67 67 69 105 58.1 94.0 74.6
100 7861 11074 11585 13699 1.18E4 9.83E3 1.87E4 1.05E4
# flux from 0.0580*0.49 sr ( 7.57E-8 sr/4px) is 0.0125 lx ( 0.0243 lx tilewise);
# tilewise luminance 0.291 cd/m2 with rel. SD 1.56E3 % (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= -154 maximum= 7861 over 15850: 0 zero: 46.4 %
# GrUp average= 0.5 minimum= -139 maximum=11074 over 15850: 0 zero: 51.8 %
# GrDw average= 0.5 minimum= -147 maximum=11585 over 15850: 0 zero: 51.0 %
# Blue average= 0.2 minimum= -143 maximum=13699 over 15850: 0 zero: 48.8 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5276.pgm -nh -nt -i 5282.txt -t 118 -s71:76 pgm/5282.pgm
Just points with luminances over 5.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 20:24:38
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5282.pgm)
# Focal length : 19.2mm (35mm equivalent: 130mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.868
# % R G1 G2 B readings R G B L / cd/m2
1 -70 -67 -67 -68 -105 -58.1 -92.6 -74.6
10 -35 -32 -32 -34 -52.5 -27.8 -46.3 -36.4
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 32 33 52.5 27.8 45.0 36.4
99 70 67 67 69 105 58.1 94.0 74.6
100 13699 13699 13699 13699 2.06E4 1.19E4 1.87E4 1.49E4
# flux from 4.84E-6 sr ( 7.57E-8 sr/4px) is 0.0119 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average=1864.3 minimum= -122 maximum= 7861 over 15850: 766048 zero: 1.6 %
# GrUp average=2646.3 minimum= -124 maximum=11074 over 15850: 766048
# GrDw average=2664.2 minimum= -131 maximum=11585 over 15850: 766048
# Blue average=1439.5 minimum= -112 maximum=13699 over 15850: 766048 zero: 1.6 %
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L500 -i 5282.txt -e 5282.eps -n 5282.ppm -t 118 -s71:76 pgm/5282.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.
