Snímek 5275
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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 20:19:35
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5275.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 -66 -68 -105 -57.7 -92.6 -74.3
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 34 32 31 33 51.0 27.3 45.0 35.6
99 70 67 66 68 105 57.7 92.6 74.3
100 2981 2382 3166 1490 4.47E3 2.41E3 2.03E3 3.13E3
# flux from 0.0580*0.48 sr ( 7.57E-8 sr/4px) is -0.00907 lx (-0.0193 lx tilewise);
# tilewise luminance -0.527 cd/m2 with rel. SD -374 % (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= -0.3 minimum= -151 maximum= 2981 over 15850: 0 zero: 46.5 %
# GrUp average= 0.0 minimum= -140 maximum= 2382 over 15850: 0 zero: 51.9 %
# GrDw average= -0.6 minimum= -147 maximum= 3166 over 15850: 0 zero: 51.4 %
# Blue average= -0.3 minimum= -143 maximum= 1490 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 5275.txt -t 118 -s71:76 pgm/5275.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 20:19:35
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5275.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 -66 -68 -105 -57.7 -92.6 -74.3
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 34 32 31 33 51.0 27.3 45.0 35.6
99 70 67 66 68 105 57.7 92.6 74.3
100 3166 3166 3166 3166 4.75E3 2.75E3 4.31E3 3.45E3
# flux from 1.36E-6 sr ( 7.57E-8 sr/4px) is 0.00147 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red average= 853.6 minimum= -114 maximum= 2981 over 15850: 766094
# GrUp average=1154.3 minimum= -104 maximum= 2382 over 15850: 766094
# GrDw average=1098.8 minimum= -122 maximum= 3166 over 15850: 766094
# Blue average= 346.7 minimum= -117 maximum= 1490 over 15850: 766094
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5276.pgm -sm100 -nh -L500 -i 5275.txt -e 5275.eps -n 5275.ppm -t 118 -s71:76 pgm/5275.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.
