Snímek 5114

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 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

skala jasu / 1 
cd/m<sup>2</sup>
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.