Snímek 5146
| 
| 
| | původní | zesvětlený | barevně kódovaný
|
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 20:35:52
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5146.pgm)
# Focal length : 12.0mm (35mm equivalent: 81mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# 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)* 0.0415
# % R G1 G2 B readings R G B L / cd/m2
1 -71 -67 -68 -69 -5.10 -2.80 -4.50 -3.61
10 -35 -31 -32 -34 -2.51 -1.31 -2.22 -1.73
50 0 0 0 0 0.00 0.00 0.00 0.00
90 40 39 40 38 2.87 1.64 2.48 2.07
99 94 132 131 87 6.75 5.46 5.67 5.91
100 15869 15866 15866 15867 1.14E3 659 1.03E3 827
# flux from 0.148*0.52 sr ( 1.94E-7 sr/4px) is 0.0316 lx ( 0.0498 lx tilewise);
# tilewise luminance 0.289 cd/m2 with rel. SD 364 % (summing pixels below 15850 and with non-zero green: there is 52.2 % of them)
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red average= 5.9 minimum= -151 maximum=15869 over 15850: 23 zero: 43.6 %
# GrUp average= 10.3 minimum= -149 maximum=15866 over 15850: 29 zero: 48.6 %
# GrDw average= 10.1 minimum= -142 maximum=15866 over 15850: 33 zero: 47.1 %
# Blue average= 5.6 minimum= -148 maximum=15867 over 15850: 46 zero: 46.3 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5146.txt -t 118 -s71:76 pgm/5146.pgm
Just points with luminances over 25 and below 5.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 20:35:52
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5146.pgm)
# Focal length : 12.0mm (35mm equivalent: 81mm)
# CCD width : 5.32mm
# Exposure time: 0.008 s (1/125)
# 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)* 0.0415
# % R G1 G2 B readings R G B L / cd/m2
1 -71 -67 -68 -69 -5.10 -2.80 -4.50 -3.61
10 -35 -31 -32 -34 -2.51 -1.31 -2.22 -1.73
50 0 0 0 0 0.00 0.00 0.00 0.00
90 40 39 40 38 2.87 1.64 2.48 2.07
99 94 132 131 87 6.75 5.46 5.67 5.91
100 15869 15869 15866 15867 1.14E3 659 1.03E3 827
# flux from 7.52E-5 sr ( 1.94E-7 sr/4px) is 0.00404 lx (points with luminances over 25 and below 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red average=1210.3 minimum= -127 maximum=15869 over 15850: 765686
# GrUp average=1633.1 minimum= -128 maximum=15866 over 15850: 765692
# GrDw average=1510.1 minimum= -142 maximum=15866 over 15850: 765696
# Blue average=1651.1 minimum= -133 maximum=15867 over 15850: 765709
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L25 -U500 -i 5146.txt -e 5146.eps -n 5146.ppm -t 118 -s71:76 pgm/5146.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.
