Snímek 5135
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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 20:14:30
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5135.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 -72 -68 -69 -70 -82.8 -45.5 -73.0 -58.5
10 -36 -33 -34 -35 -41.4 -22.3 -36.5 -29.0
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 40.2 21.6 35.5 28.1
99 71 67 68 69 81.6 44.8 72.0 57.7
100 15876 13979 15879 6599 1.82E4 9.92E3 6.88E3 1.28E4
# flux from 0.654*0.48 sr ( 8.59E-7 sr/4px) is -0.121 lx (-0.220 lx tilewise);
# tilewise luminance -0.302 cd/m2 with rel. SD -645 % (summing pixels below 15850 and with non-zero green: there is 48.2 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average= -0.4 minimum= -151 maximum=15876 over 15850: 1 zero: 46.6 %
# GrUp average= -0.5 minimum= -150 maximum=13979 over 15850: 0 zero: 52.7 %
# GrDw average= -0.4 minimum= -149 maximum=15879 over 15850: 1 zero: 51.0 %
# Blue average= -0.4 minimum= -148 maximum= 6599 over 15850: 0 zero: 49.0 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5135.txt -t 118 -s71:76 pgm/5135.pgm
Just points with luminances over 1.0E3 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 20:14:30
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5135.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 -69 -70 -81.6 -45.5 -73.0 -58.1
10 -36 -33 -34 -35 -41.4 -22.3 -36.5 -29.0
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 40.2 21.6 35.5 28.1
99 71 67 68 70 81.6 44.8 73.0 57.7
100 15879 15879 15879 15879 1.82E4 1.05E4 1.66E4 1.32E4
# flux from 9.40E-6 sr ( 8.59E-7 sr/4px) is 0.0227 lx (points with luminances over 1.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average=3033.7 minimum= -111 maximum=15876 over 15850: 766100
# GrUp average=5081.8 minimum= -110 maximum=13979 over 15850: 766099
# GrDw average=3765.4 minimum= -102 maximum=15879 over 15850: 766100
# Blue average=2242.5 minimum= -109 maximum= 6599 over 15850: 766099
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L1000 -i 5135.txt -e 5135.eps -n 5135.ppm -t 118 -s71:76 pgm/5135.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.