Snímek 5281
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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 20:22:56
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5281.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 -69 -105 -58.1 -94.0 -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 34 52.5 27.8 46.3 36.4
99 70 67 67 69 105 58.1 94.0 74.6
100 951 726 960 802 1.43E3 732 1.09E3 975
# flux from 0.0580*0.48 sr ( 7.57E-8 sr/4px) is 1.95E-5 lx (-0.00122 lx tilewise);
# tilewise luminance 0.00159 cd/m2 with rel. SD 1.06E5 % (summing pixels below 15850 and with non-zero green: there is 48.3 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= -0.1 minimum= -151 maximum= 951 over 15850: 0 zero: 46.5 %
# GrUp average= -0.1 minimum= -144 maximum= 726 over 15850: 0 zero: 52.3 %
# GrDw average= 0.2 minimum= -147 maximum= 960 over 15850: 0 zero: 51.0 %
# Blue average= 0.0 minimum= -143 maximum= 802 over 15850: 0 zero: 49.0 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5276.pgm -nh -nt -i 5281.txt -t 118 -s71:76 pgm/5281.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 20:22:56
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5281.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 34 52.5 27.8 46.3 36.4
99 70 67 67 69 105 58.1 94.0 74.6
100 960 960 960 960 1.44E3 833 1.31E3 1.04E3
# flux from 5.30E-7 sr ( 7.57E-8 sr/4px) is 3.31E-4 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= 546.1 minimum= -122 maximum= 951 over 15850: 766105
# GrUp average= 592.1 minimum= -117 maximum= 726 over 15850: 766105
# GrDw average= 614.6 minimum= -122 maximum= 960 over 15850: 766105
# Blue average= 163.7 minimum= -129 maximum= 802 over 15850: 766105
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L500 -i 5281.txt -e 5281.eps -n 5281.ppm -t 118 -s71:76 pgm/5281.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.
