Snímek 5153
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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 21:40:17
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5153.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 -71 -82.8 -45.5 -74.1 -58.5
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 37 35 35 36 42.5 23.3 37.6 30.0
99 75 72 72 73 86.2 47.8 76.1 61.3
100 15985 15982 15982 15983 1.84E4 1.06E4 1.67E4 1.33E4
# flux from 0.654*0.51 sr ( 8.59E-7 sr/4px) is 0.708 lx ( 1.56 lx tilewise);
# tilewise luminance 2.22 cd/m2 with rel. SD 340 % (summing pixels below 15850 and with non-zero green: there is 50.9 % of them)
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red average= 2.5 minimum= -146 maximum=15985 over 15850: 33 zero: 44.8 %
# GrUp average= 3.4 minimum= -140 maximum=15982 over 15850: 45 zero: 49.4 %
# GrDw average= 3.5 minimum= -148 maximum=15982 over 15850: 48 zero: 48.7 %
# Blue average= 2.6 minimum= -155 maximum=15983 over 15850: 32 zero: 47.1 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5154.pgm -nh -nt -i 5153.txt -t 118 -s71:76 pgm/5153.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 21:40:17
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5153.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 -67 -68 -70 -81.6 -44.8 -73.0 -57.7
10 -35 -32 -33 -34 -40.2 -21.6 -35.5 -28.1
50 0 0 0 0 0.00 0.00 0.00 0.00
90 37 35 35 36 42.5 23.3 37.6 30.0
99 75 72 73 73 86.2 48.2 76.1 61.5
100 15985 15985 15985 15985 1.84E4 1.06E4 1.67E4 1.33E4
# flux from 1.33E-4 sr ( 8.59E-7 sr/4px) is 0.257 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average=2719.8 minimum= -120 maximum=15985 over 15850: 765918
# GrUp average=3374.0 minimum= -125 maximum=15982 over 15850: 765930
# GrDw average=3051.5 minimum= -138 maximum=15982 over 15850: 765933
# Blue average=2891.9 minimum= -123 maximum=15983 over 15850: 765917
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L500 -i 5153.txt -e 5153.eps -n 5153.ppm -t 118 -s71:76 pgm/5153.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.