Snímek 5152
| 
| 
| | 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 21:40:06
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5152.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# 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 -70 -66 -66 -69 -5.03 -2.74 -4.50 -3.54
10 -33 -29 -29 -32 -2.37 -1.20 -2.09 -1.61
50 0 0 0 0 0.00 0.00 0.00 0.00
90 55 62 62 51 3.95 2.57 3.32 3.06
99 151 226 226 136 10.8 9.38 8.87 9.90
100 15992 15989 15989 15990 1.15E3 664 1.04E3 834
# flux from 0.654*0.61 sr ( 8.59E-7 sr/4px) is 0.465 lx ( 0.688 lx tilewise);
# tilewise luminance 0.948 cd/m2 with rel. SD 198 % (summing pixels below 15850 and with non-zero green: there is 60.6 % of them)
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red average= 18.8 minimum= -158 maximum=15992 over 15850: 111 zero: 37.4 %
# GrUp average= 28.6 minimum= -148 maximum=15989 over 15850: 139 zero: 40.0 %
# GrDw average= 28.5 minimum= -162 maximum=15989 over 15850: 135 zero: 38.9 %
# Blue average= 17.6 minimum= -143 maximum=15990 over 15850: 137 zero: 40.0 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5154.pgm -nh -nt -i 5152.txt -t 118 -s71:76 pgm/5152.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 21:40:06
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5152.pgm)
# Focal length : 5.7mm (35mm equivalent: 39mm)
# 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 -69 -65 -66 -67 -4.96 -2.72 -4.37 -3.50
10 -32 -28 -29 -31 -2.30 -1.18 -2.02 -1.57
50 0 0 0 0 0.00 0.00 0.00 0.00
90 55 62 62 51 3.95 2.57 3.32 3.06
99 151 227 227 136 10.8 9.43 8.87 9.92
100 15992 15992 15992 15992 1.15E3 664 1.04E3 834
# flux from 7.97E-4 sr ( 8.59E-7 sr/4px) is 0.0631 lx (points with luminances over 25 and below 5.0E2 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red average=1756.3 minimum= -118 maximum=15992 over 15850: 765104
# GrUp average=2214.3 minimum= -125 maximum=15989 over 15850: 765132
# GrDw average=2204.1 minimum= -125 maximum=15989 over 15850: 765128
# Blue average=1891.2 minimum= -124 maximum=15990 over 15850: 765130
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L25 -U500 -i 5152.txt -e 5152.eps -n 5152.ppm -t 118 -s71:76 pgm/5152.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.
