Snímek 5246
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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 18:33:28
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5246.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# 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)* 0.00266
# % R G1 G2 B readings R G B L / cd/m2
1 -24 -11 -10 -38 -0.110 -0.0279 -0.159 -0.0568
10 38 54 55 10 0.175 0.145 0.0417 0.155
50 197 239 240 111 0.906 0.637 0.463 0.731
90 2033 2408 2409 980 9.35 6.40 4.09 7.43
99 8535 9937 9959 4024 39.2 26.4 16.8 30.9
100 16383 16383 16383 16383 75.3 43.5 68.4 54.7
# flux from 0.652 sr ( 8.59E-7 sr/4px) is 1.74 lx ( 1.80 lx tilewise);
# tilewise luminance 2.56 cd/m2 with rel. SD 151 % (summing pixels below 15850)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 763.7 minimum= -144 maximum=16383 over 15850: 2057 zero: 1.1 %
# GrUp average= 896.4 minimum= -125 maximum=16383 over 15850: 2569
# GrDw average= 897.0 minimum= -110 maximum=16383 over 15850: 2556
# Blue average= 394.0 minimum= -141 maximum=16383 over 15850: 1265 zero: 3.2 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5238.pgm -nh -nt -i 5246.txt -t 118 -s71:76 pgm/5246.pgm
Just points with luminances below 40 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:26 18:33:28
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5246.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# CCD width : 5.32mm
# Exposure time: 0.125 s (1/8)
# 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)* 0.00266
# % R G1 G2 B readings R G B L / cd/m2
1 -24 -11 -10 -38 -0.110 -0.0279 -0.159 -0.0568
10 38 54 55 10 0.175 0.145 0.0417 0.155
50 197 239 240 111 0.906 0.637 0.463 0.731
90 2033 2408 2409 980 9.35 6.40 4.09 7.43
99 8535 9937 9959 4024 39.2 26.4 16.8 30.9
100 16383 16383 16383 16383 75.3 43.5 68.4 54.7
# flux from 0.651 sr ( 8.59E-7 sr/4px) is 1.70 lx (points with luminances below 40 )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red average= 747.0 minimum= -144 maximum=16383 over 15850: 3167 zero: 1.1 %
# GrUp average= 877.4 minimum= -125 maximum=16383 over 15850: 3679
# GrDw average= 878.2 minimum= -110 maximum=16383 over 15850: 3666
# Blue average= 386.0 minimum= -141 maximum=16383 over 15850: 2375 zero: 3.2 %
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5238.pgm -sm100 -nh -U40 -i 5246.txt -e 5246.eps -n 5246.ppm -t 118 -s71:76 pgm/5246.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.
