Snímek 5133
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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 20:14:00
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5133.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# CCD width : 5.32mm
# Exposure time: 0.067 s (1/15)
# 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)* 0.00498
# % R G1 G2 B readings R G B L / cd/m2
1 -71 -67 -68 -69 -0.612 -0.336 -0.540 -0.433
10 -35 -31 -32 -34 -0.302 -0.157 -0.266 -0.208
50 0 0 0 0 0.00 0.00 0.00 0.00
90 39 38 38 38 0.336 0.189 0.297 0.241
99 84 88 89 81 0.724 0.441 0.634 0.540
100 16287 16284 16284 16285 140 81.1 127 102
# flux from 0.654*0.53 sr ( 8.59E-7 sr/4px) is 0.0200 lx ( 0.0341 lx tilewise);
# tilewise luminance 0.0498 cd/m2 with rel. SD 371 % (summing pixels below 15850 and with non-zero green: there is 52.7 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average= 7.7 minimum= -151 maximum=16287 over 15850: 32 zero: 43.4 %
# GrUp average= 11.8 minimum= -141 maximum=16284 over 15850: 40 zero: 47.5 %
# GrDw average= 11.5 minimum= -146 maximum=16284 over 15850: 38 zero: 47.0 %
# Blue average= 6.5 minimum= -143 maximum=16285 over 15850: 40 zero: 45.7 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5133.txt -t 118 -s71:76 pgm/5133.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 20:14:00
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5133.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# CCD width : 5.32mm
# Exposure time: 0.067 s (1/15)
# 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)* 0.00498
# % R G1 G2 B readings R G B L / cd/m2
1 -71 -67 -68 -69 -0.612 -0.336 -0.540 -0.433
10 -35 -31 -32 -34 -0.302 -0.157 -0.266 -0.208
50 0 0 0 0 0.00 0.00 0.00 0.00
90 39 38 38 38 0.336 0.189 0.297 0.241
99 84 88 89 81 0.724 0.441 0.634 0.540
100 16287 16284 16287 16287 140 81.2 127 102
# flux from 0.00296 sr ( 8.59E-7 sr/4px) is 0.0120 lx (points with luminances over 1.0 and below 25 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average= 581.4 minimum= -141 maximum=16287 over 15850: 762623
# GrUp average= 838.6 minimum= -126 maximum=16284 over 15850: 762631
# GrDw average= 841.7 minimum= -134 maximum=16284 over 15850: 762629
# Blue average= 444.7 minimum= -135 maximum=16285 over 15850: 762631 zero: 1.3 %
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L1 -U25 -i 5133.txt -e 5133.eps -n 5133.ppm -t 118 -s71:76 pgm/5133.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.