Snímek 5151
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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 21:34:47
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5151.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 -55 -46 -47 -56 -0.253 -0.124 -0.234 -0.169
10 -11 0 0 -12 -0.0506 0.00 -0.0501 -0.0177
50 45 62 62 40 0.207 0.165 0.167 0.180
90 510 768 769 428 2.34 2.04 1.79 2.15
99 2212 3315 3309 1877 10.2 8.80 7.83 9.28
100 15992 15989 15989 15990 73.5 42.5 66.7 53.4
# flux from 0.654*0.92 sr ( 8.59E-7 sr/4px) is 0.484 lx ( 0.517 lx tilewise);
# tilewise luminance 0.721 cd/m2 with rel. SD 176 % (summing pixels below 15850 and with non-zero green: there is 91.7 % of them)
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red average= 208.2 minimum= -148 maximum=15992 over 15850: 567 zero: 11.7 %
# GrUp average= 295.3 minimum= -138 maximum=15989 over 15850: 677 zero: 8.3 %
# GrDw average= 295.0 minimum= -135 maximum=15989 over 15850: 677 zero: 8.2 %
# Blue average= 178.7 minimum= -143 maximum=15990 over 15850: 607 zero: 14.1 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5154.pgm -nh -nt -i 5151.txt -t 118 -s71:76 pgm/5151.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 21:34:47
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5151.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 -55 -46 -47 -56 -0.253 -0.124 -0.234 -0.169
10 -11 0 0 -12 -0.0506 0.00 -0.0501 -0.0177
50 45 62 62 40 0.207 0.165 0.167 0.180
90 510 768 769 428 2.34 2.04 1.79 2.15
99 2212 3315 3309 1878 10.2 8.80 7.84 9.28
100 15992 15989 15989 15992 73.5 42.5 66.7 53.4
# flux from 0.101 sr ( 8.59E-7 sr/4px) is 0.378 lx (points with luminances over 1.0 and below 25 )
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red average= 936.7 minimum= -141 maximum=15992 over 15850: 648133
# GrUp average=1371.4 minimum= -127 maximum=15989 over 15850: 648243
# GrDw average=1370.6 minimum= -125 maximum=15989 over 15850: 648243
# Blue average= 766.0 minimum= -132 maximum=15990 over 15850: 648173
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5154.pgm -sm100 -nh -L1 -U25 -i 5151.txt -e 5151.eps -n 5151.ppm -t 118 -s71:76 pgm/5151.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.
