Snímek 5136
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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 : 2006:02:24 20:22:45
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5136.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# Aperture : f/2.8
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.664
# % R G1 G2 B readings R G B L / cd/m2
1 -71 -68 -68 -70 -81.6 -45.2 -73.0 -57.9
10 -36 -33 -33 -35 -41.4 -21.9 -36.5 -28.7
50 0 0 0 0 0.00 0.00 0.00 0.00
90 36 33 34 35 41.4 22.3 36.5 29.0
99 71 68 69 70 81.6 45.5 73.0 58.1
100 15915 15912 15912 15890 1.83E4 1.06E4 1.66E4 1.33E4
# flux from 0.654*0.49 sr ( 8.59E-7 sr/4px) is 0.0957 lx ( 0.221 lx tilewise);
# tilewise luminance 0.232 cd/m2 with rel. SD 1.02E3 % (summing pixels below 15850 and with non-zero green: there is 48.9 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average= 0.4 minimum= -151 maximum=15915 over 15850: 4 zero: 46.2 %
# GrUp average= 0.3 minimum= -156 maximum=15912 over 15850: 6 zero: 51.9 %
# GrDw average= 0.5 minimum= -149 maximum=15912 over 15850: 8 zero: 50.4 %
# Blue average= 0.3 minimum= -153 maximum=15890 over 15850: 2 zero: 48.6 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5136.txt -t 118 -s71:76 pgm/5136.pgm
Just points with luminances over 5.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 20:22:45
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5136.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# Aperture : f/2.8
# ISO equiv. : 200
# Selected image percentils L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.664
# % R G1 G2 B readings R G B L / cd/m2
1 -71 -68 -68 -70 -81.6 -45.2 -73.0 -57.9
10 -36 -33 -33 -35 -41.4 -21.9 -36.5 -28.7
50 0 0 0 0 0.00 0.00 0.00 0.00
90 36 33 34 35 41.4 22.3 36.5 29.0
99 71 68 69 70 81.6 45.5 73.0 58.1
100 15915 15912 15912 15890 1.83E4 1.06E4 1.66E4 1.33E4
# flux from 3.94E-5 sr ( 8.59E-7 sr/4px) is 0.0600 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average=2374.6 minimum= -137 maximum=15915 over 15850: 766057
# GrUp average=2316.0 minimum= -156 maximum=15912 over 15850: 766059
# GrDw average=1889.0 minimum= -135 maximum=15912 over 15850: 766061
# Blue average=1985.3 minimum= -136 maximum=15890 over 15850: 766055 zero: 1.8 %
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L500 -i 5136.txt -e 5136.eps -n 5136.ppm -t 118 -s71:76 pgm/5136.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.