Snímek 5118

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 19:16:08
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5118.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# 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   -68   -69   -70        -81.6    -45.5    -73.0    -58.1  
 10   -36   -33   -33   -35        -41.4    -21.9    -36.5    -28.7  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    33    34    35         41.4     22.3     36.5     29.0  
 99    72    68    69    70         82.8     45.5     73.0     58.5  
100  3749  3326  5806  3961         4.31E3   3.03E3   4.13E3   3.48E3
# flux from 0.654*0.49 sr ( 8.59E-7 sr/4px) is  0.0891 lx ( 0.186 lx tilewise);
# tilewise luminance  0.209 cd/m2 with rel. SD  984 % (summing pixels below 15850 and with non-zero green: there is 48.7 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=   0.2  minimum= -151  maximum= 3749   over 15850:   0 zero: 46.6 %
# GrUp average=   0.3  minimum= -133  maximum= 3326   over 15850:   0 zero: 52.2 %
# GrDw average=   0.5  minimum= -146  maximum= 5806   over 15850:   0 zero: 50.4 %
# Blue average=   0.3  minimum= -154  maximum= 3961   over 15850:   0 zero: 48.7 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5119.pgm -nh -nt -i 5118.txt -t 118 -s71:76 pgm/5118.pgm

Just points with luminances over 1.0E3 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:24 19:16:08
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5118.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# 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   -68   -68   -70        -81.6    -45.2    -73.0    -57.9  
 10   -36   -33   -33   -35        -41.4    -21.9    -36.5    -28.7  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    33    34    35         41.4     22.3     36.5     29.0  
 99    72    68    69    70         82.8     45.5     73.0     58.5  
100  5806  5806  5806  5806         6.67E3   3.86E3   6.06E3   4.84E3
# flux from 3.17E-5 sr ( 8.59E-7 sr/4px) is  0.0496 lx (points with luminances over  1.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=1562.5  minimum= -114  maximum= 3749   over 15850: 766075
# GrUp average=2240.8  minimum= -112  maximum= 3326   over 15850: 766075
# GrDw average=2166.8  minimum= -104  maximum= 5806   over 15850: 766075
# Blue average=1358.2  minimum= -120  maximum= 3961   over 15850: 766075

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5119.pgm -sm100 -nh -L1000 -i 5118.txt -e 5118.eps -n 5118.ppm -t 118 -s71:76 pgm/5118.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.