Snímek 5114
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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 19:13:47
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5114.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 -69 -64 -65 -67 -0.317 -0.171 -0.280 -0.222
10 -32 -27 -28 -31 -0.147 -0.0731 -0.129 -0.0990
50 0 1 1 0 0.00 0.00266 0.00 0.00173
90 50 53 54 47 0.230 0.142 0.196 0.173
99 243 401 407 204 1.12 1.07 0.851 1.09
100 15938 15935 15935 15936 73.3 42.3 66.5 53.2
# flux from 0.654*0.64 sr ( 8.59E-7 sr/4px) is 0.0475 lx ( 0.0627 lx tilewise);
# tilewise luminance 0.0904 cd/m2 with rel. SD 288 % (summing pixels below 15850 and with non-zero green: there is 63.6 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average= 28.4 minimum= -151 maximum=15938 over 15850: 209 zero: 35.4 %
# GrUp average= 42.6 minimum= -141 maximum=15935 over 15850: 285 zero: 37.0 %
# GrDw average= 42.3 minimum= -149 maximum=15935 over 15850: 277 zero: 35.9 %
# Blue average= 24.1 minimum= -143 maximum=15936 over 15850: 186 zero: 38.4 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5114.txt -t 118 -s71:76 pgm/5114.pgm
Just points with luminances over 1.0 and below 25 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 19:13:47
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5114.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 -69 -64 -65 -67 -0.317 -0.171 -0.280 -0.222
10 -32 -27 -28 -31 -0.147 -0.0731 -0.129 -0.0990
50 0 1 1 0 0.00 0.00266 0.00 0.00173
90 50 53 54 47 0.230 0.142 0.196 0.173
99 243 402 407 204 1.12 1.08 0.851 1.09
100 15938 15938 15938 15938 73.3 42.4 66.5 53.2
# flux from 0.00655 sr ( 8.59E-7 sr/4px) is 0.0277 lx (points with luminances over 1.0 and below 25 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average=1068.5 minimum= -137 maximum=15938 over 15850: 758355
# GrUp average=1592.3 minimum= -120 maximum=15935 over 15850: 758431
# GrDw average=1618.7 minimum= -112 maximum=15935 over 15850: 758423
# Blue average= 839.1 minimum= -135 maximum=15936 over 15850: 758332
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L1 -U25 -i 5114.txt -e 5114.eps -n 5114.ppm -t 118 -s71:76 pgm/5114.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.
