Snímek 5233

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    : 2006:02:26 18:14:37
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5233.pgm)
# Focal length : 10.7mm  (35mm equivalent: 72mm)
# CCD width    : 5.32mm
# Exposure time: 0.001 s  (1/2000)
# 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)* 0.664
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -67   -68   -69        -81.6    -44.8    -72.0    -57.7  
 10   -36   -32   -33   -34        -41.4    -21.6    -35.5    -28.5  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    34    34    35         41.4     22.6     36.5     29.2  
 99    73    70    71    71         83.9     46.8     74.1     59.8  
100 15869 15866 15866 15867         1.82E4   1.05E4   1.66E4   1.32E4
# flux from 0.186*0.49 sr ( 2.44E-7 sr/4px) is  0.148 lx ( 0.364 lx tilewise);
# tilewise luminance  1.65 cd/m2 with rel. SD  519 % (summing pixels below 15850 and with non-zero green: there is 49.4 % of them)
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red  average=   2.2  minimum= -159  maximum=15869   over 15850:  36 zero: 45.9 %
# GrUp average=   2.8  minimum= -140  maximum=15866   over 15850:  42 zero: 50.8 %
# GrDw average=   2.5  minimum= -138  maximum=15866   over 15850:  41 zero: 50.5 %
# Blue average=   1.9  minimum= -152  maximum=15867   over 15850:  14 zero: 48.4 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5238.pgm -nh -nt -i 5233.txt -t 118 -s71:76 pgm/5233.pgm

Just points with luminances over 6.0E2 and below 1.0E4 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:26 18:14:37
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5233.pgm)
# Focal length : 10.7mm  (35mm equivalent: 72mm)
# CCD width    : 5.32mm
# Exposure time: 0.001 s  (1/2000)
# 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)* 0.664
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -67   -68   -69        -81.6    -44.8    -72.0    -57.7  
 10   -36   -32   -33   -34        -41.4    -21.6    -35.5    -28.5  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    34    34    35         41.4     22.6     36.5     29.2  
 99    73    70    71    71         83.9     46.8     74.1     59.8  
100 15869 15869 15869 15869         1.82E4   1.05E4   1.66E4   1.32E4
# flux from 4.02E-5 sr ( 2.44E-7 sr/4px) is  0.0817 lx (points with luminances over  6.0E2  and below  1.0E4 )
# Fuji Devignetting: 2 # dark frame dark/5238.pgm subtracted from all values
# Red  average=3381.2  minimum= -127  maximum=15869   over 15850: 765919
# GrUp average=3135.4  minimum= -123  maximum=15866   over 15850: 765925
# GrDw average=3055.9  minimum= -109  maximum=15866   over 15850: 765924
# Blue average=2771.7  minimum= -130  maximum=15867   over 15850: 765897

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5238.pgm -sm100 -nh -L600 -U10000 -i 5233.txt -e 5233.eps -n 5233.ppm -t 118 -s71:76 pgm/5233.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.