Snímek 5138

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 20:24:27
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5138.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   -64   -67        -0.317   -0.170   -0.280   -0.222 
 10   -31   -27   -27   -30        -0.143   -0.0718  -0.125   -0.0965
 50     2     4     5     1         0.00920   0.0120   0.00417   0.0110
 90    65    72    73    61         0.299    0.193    0.255    0.230 
 99  1344  1990  1987   929         6.18     5.28     3.88     5.60  
100 16349 16371 16383 16383         75.2     43.5     68.4     54.6  
# flux from 0.654*0.66 sr ( 8.59E-7 sr/4px) is  0.140 lx ( 0.158 lx tilewise);
# tilewise luminance  0.216 cd/m2 with rel. SD  331 % (summing pixels below 15850 and with non-zero green: there is 65.8 % of them)
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red  average=  80.1  minimum= -155  maximum=16349   over 15850: 150 zero: 33.8 %
# GrUp average= 119.4  minimum= -140  maximum=16371   over 15850: 186 zero: 34.7 %
# GrDw average= 118.6  minimum= -162  maximum=16383   over 15850: 192 zero: 33.8 %
# Blue average=  61.1  minimum= -144  maximum=16383   over 15850: 174 zero: 36.2 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5154.pgm -nh -nt -i 5138.txt -t 118 -s71:76 pgm/5138.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 20:24:27
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5138.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   -64   -67        -0.317   -0.170   -0.280   -0.222 
 10   -31   -27   -27   -30        -0.143   -0.0718  -0.125   -0.0965
 50     2     4     5     1         0.00920   0.0120   0.00417   0.0110
 90    65    72    73    61         0.299    0.193    0.255    0.230 
 99  1345  1992  1988   930         6.18     5.29     3.88     5.60  
100 16383 16383 16383 16383         75.3     43.5     68.4     54.7  
# flux from 0.0227 sr ( 8.59E-7 sr/4px) is  0.102  lx (points with luminances over  1.0    and below   25   )
# Fuji Devignetting: 1 # dark frame dark/5154.pgm subtracted from all values
# Red  average=1122.7  minimum= -137  maximum=16349   over 15850: 739565
# GrUp average=1645.9  minimum= -135  maximum=16371   over 15850: 739601
# GrDw average=1645.8  minimum= -118  maximum=16383   over 15850: 739607
# Blue average= 797.1  minimum= -132  maximum=16383   over 15850: 739589

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5154.pgm -sm100 -nh -L1 -U25 -i 5138.txt -e 5138.eps -n 5138.ppm -t 118 -s71:76 pgm/5138.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.