Snímek 5233
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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 18:14:37
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5233.pgm)
# Focal length : 10.7mm (35mm equivalent: 72mm)
# 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 -67 -68 -69 -81.6 -44.8 -72.0 -57.7
10 -36 -32 -33 -34 -41.4 -21.6 -35.5 -28.5
50 0 0 0 0 0.00 0.00 0.00 0.00
90 36 34 34 35 41.4 22.6 36.5 29.2
99 73 70 71 71 83.9 46.8 74.1 59.8
100 15869 15866 15866 15867 1.82E4 1.05E4 1.66E4 1.32E4
# flux from 0.186*0.49 sr ( 2.44E-7 sr/4px) is 0.148 lx ( 0.364 lx tilewise);
# tilewise luminance 1.65 cd/m2 with rel. SD 519 % (summing pixels below 15850 and with non-zero green: there is 49.4 % of them)
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red average= 2.2 minimum= -159 maximum=15869 over 15850: 36 zero: 45.9 %
# GrUp average= 2.8 minimum= -140 maximum=15866 over 15850: 42 zero: 50.8 %
# GrDw average= 2.5 minimum= -138 maximum=15866 over 15850: 41 zero: 50.5 %
# Blue average= 1.9 minimum= -152 maximum=15867 over 15850: 14 zero: 48.4 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5233.txt -t 118 -s71:76 pgm/5233.pgm
Just points with luminances over 6.0E2 and below 1.0E4 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:14:37
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5233.pgm)
# Focal length : 10.7mm (35mm equivalent: 72mm)
# 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 -67 -68 -69 -81.6 -44.8 -72.0 -57.7
10 -36 -32 -33 -34 -41.4 -21.6 -35.5 -28.5
50 0 0 0 0 0.00 0.00 0.00 0.00
90 36 34 34 35 41.4 22.6 36.5 29.2
99 73 70 71 71 83.9 46.8 74.1 59.8
100 15869 15869 15869 15869 1.82E4 1.05E4 1.66E4 1.32E4
# flux from 4.02E-5 sr ( 2.44E-7 sr/4px) is 0.0817 lx (points with luminances over 6.0E2 and below 1.0E4 )
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red average=3381.2 minimum= -127 maximum=15869 over 15850: 765919
# GrUp average=3135.4 minimum= -123 maximum=15866 over 15850: 765925
# GrDw average=3055.9 minimum= -109 maximum=15866 over 15850: 765924
# Blue average=2771.7 minimum= -130 maximum=15867 over 15850: 765897
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -L600 -U10000 -i 5233.txt -e 5233.eps -n 5233.ppm -t 118 -s71:76 pgm/5233.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.