Snímek 5118
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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 19:16:08
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5118.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 -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 72 68 69 70 82.8 45.5 73.0 58.5
100 3749 3326 5806 3961 4.31E3 3.03E3 4.13E3 3.48E3
# flux from 0.654*0.49 sr ( 8.59E-7 sr/4px) is 0.0891 lx ( 0.186 lx tilewise);
# tilewise luminance 0.209 cd/m2 with rel. SD 984 % (summing pixels below 15850 and with non-zero green: there is 48.7 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average= 0.2 minimum= -151 maximum= 3749 over 15850: 0 zero: 46.6 %
# GrUp average= 0.3 minimum= -133 maximum= 3326 over 15850: 0 zero: 52.2 %
# GrDw average= 0.5 minimum= -146 maximum= 5806 over 15850: 0 zero: 50.4 %
# Blue average= 0.3 minimum= -154 maximum= 3961 over 15850: 0 zero: 48.7 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5118.txt -t 118 -s71:76 pgm/5118.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 19:16:08
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5118.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 72 68 69 70 82.8 45.5 73.0 58.5
100 5806 5806 5806 5806 6.67E3 3.86E3 6.06E3 4.84E3
# flux from 3.17E-5 sr ( 8.59E-7 sr/4px) is 0.0496 lx (points with luminances over 1.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average=1562.5 minimum= -114 maximum= 3749 over 15850: 766075
# GrUp average=2240.8 minimum= -112 maximum= 3326 over 15850: 766075
# GrDw average=2166.8 minimum= -104 maximum= 5806 over 15850: 766075
# Blue average=1358.2 minimum= -120 maximum= 3961 over 15850: 766075
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L1000 -i 5118.txt -e 5118.eps -n 5118.ppm -t 118 -s71:76 pgm/5118.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.