Snímek 5266
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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 20:00:55
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5266.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 -33 -52.5 -27.8 -45.0 -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 66 67 68 105 57.7 92.6 74.3
100 5557 5897 8091 1950 8.34E3 6.07E3 2.66E3 6.87E3
# flux from 0.0580*0.48 sr ( 7.57E-8 sr/4px) is -0.00251 lx (-0.00638 lx tilewise);
# tilewise luminance -0.0395 cd/m2 with rel. SD-4.40E3 % (summing pixels below 15850 and with non-zero green: there is 48.4 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= -0.1 minimum= -151 maximum= 5557 over 15850: 0 zero: 46.5 %
# GrUp average= -0.2 minimum= -146 maximum= 5897 over 15850: 0 zero: 51.9 %
# GrDw average= 0.0 minimum= -147 maximum= 8091 over 15850: 0 zero: 51.2 %
# Blue average= -0.1 minimum= -143 maximum= 1950 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 5266.txt -t 118 -s71:76 pgm/5266.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 20:00:55
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5266.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 -33 -52.5 -27.8 -45.0 -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 66 67 68 105 57.7 92.6 74.3
100 8091 8091 8091 8091 1.21E4 7.02E3 1.10E4 8.81E3
# flux from 1.59E-6 sr ( 7.57E-8 sr/4px) is 0.00261 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average=1486.4 minimum= -132 maximum= 5557 over 15850: 766091 zero: 4.8 %
# GrUp average=1220.9 minimum= -128 maximum= 5897 over 15850: 766091
# GrDw average=1986.3 minimum= -111 maximum= 8091 over 15850: 766091
# Blue average= 437.1 minimum= -122 maximum= 1950 over 15850: 766091
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L500 -i 5266.txt -e 5266.eps -n 5266.ppm -t 118 -s71:76 pgm/5266.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.