Snímek 5244
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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 18:33:10
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5244.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 -70 -66 -67 -69 -80.5 -44.2 -72.0 -56.9
10 -35 -31 -32 -34 -40.2 -20.9 -35.5 -27.7
50 0 0 0 0 0.00 0.00 0.00 0.00
90 39 36 37 36 44.8 24.3 37.6 31.5
99 78 77 77 74 89.7 51.2 77.2 64.6
100 15977 15974 15951 15959 1.84E4 1.06E4 1.66E4 1.33E4
# flux from 0.654*0.52 sr ( 8.59E-7 sr/4px) is 1.71 lx ( 3.45 lx tilewise);
# tilewise luminance 4.86 cd/m2 with rel. SD 235 % (summing pixels below 15850 and with non-zero green: there is 52.2 % of them)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 5.7 minimum= -163 maximum=15977 over 15850: 36 zero: 43.4 %
# GrUp average= 7.1 minimum= -140 maximum=15974 over 15850: 39 zero: 48.5 %
# GrDw average= 6.9 minimum= -152 maximum=15951 over 15850: 47 zero: 47.2 %
# Blue average= 3.9 minimum= -178 maximum=15959 over 15850: 12 zero: 46.7 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5244.txt -t 118 -s71:76 pgm/5244.pgm
Just points with luminances over 3.0E2 and below 5.0E3 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:33:10
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5244.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 -70 -66 -67 -69 -80.5 -44.2 -72.0 -56.9
10 -35 -31 -32 -34 -40.2 -20.9 -35.5 -27.7
50 0 0 0 0 0.00 0.00 0.00 0.00
90 39 36 37 36 44.8 24.3 37.6 31.5
99 78 77 77 74 89.7 51.2 77.2 64.6
100 15977 15974 15951 15977 1.84E4 1.06E4 1.67E4 1.33E4
# flux from 4.22E-4 sr ( 8.59E-7 sr/4px) is 0.515 lx (points with luminances over 3.0E2 and below 5.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average=1757.3 minimum= -140 maximum=15977 over 15850: 765586
# GrUp average=1849.6 minimum= -136 maximum=15974 over 15850: 765589
# GrDw average=1796.5 minimum= -122 maximum=15951 over 15850: 765597
# Blue average=1220.2 minimum= -155 maximum=15959 over 15850: 765562
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -L300 -U5000 -i 5244.txt -e 5244.eps -n 5244.ppm -t 118 -s71:76 pgm/5244.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.