Snímek 5135

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 20:14:30
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5135.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   -72   -68   -69   -70        -82.8    -45.5    -73.0    -58.5  
 10   -36   -33   -34   -35        -41.4    -22.3    -36.5    -29.0  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    35    32    33    34         40.2     21.6     35.5     28.1  
 99    71    67    68    69         81.6     44.8     72.0     57.7  
100 15876 13979 15879  6599         1.82E4   9.92E3   6.88E3   1.28E4
# flux from 0.654*0.48 sr ( 8.59E-7 sr/4px) is -0.121 lx (-0.220 lx tilewise);
# tilewise luminance -0.302 cd/m2 with rel. SD -645 % (summing pixels below 15850 and with non-zero green: there is 48.2 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=  -0.4  minimum= -151  maximum=15876   over 15850:   1 zero: 46.6 %
# GrUp average=  -0.5  minimum= -150  maximum=13979   over 15850:   0 zero: 52.7 %
# GrDw average=  -0.4  minimum= -149  maximum=15879   over 15850:   1 zero: 51.0 %
# Blue average=  -0.4  minimum= -148  maximum= 6599   over 15850:   0 zero: 49.0 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5119.pgm -nh -nt -i 5135.txt -t 118 -s71:76 pgm/5135.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 20:14:30
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5135.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   -34   -35        -41.4    -22.3    -36.5    -29.0  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    35    32    33    34         40.2     21.6     35.5     28.1  
 99    71    67    68    70         81.6     44.8     73.0     57.7  
100 15879 15879 15879 15879         1.82E4   1.05E4   1.66E4   1.32E4
# flux from 9.40E-6 sr ( 8.59E-7 sr/4px) is  0.0227 lx (points with luminances over  1.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=3033.7  minimum= -111  maximum=15876   over 15850: 766100
# GrUp average=5081.8  minimum= -110  maximum=13979   over 15850: 766099
# GrDw average=3765.4  minimum= -102  maximum=15879   over 15850: 766100
# Blue average=2242.5  minimum= -109  maximum= 6599   over 15850: 766099

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5119.pgm -sm100 -nh -L1000 -i 5135.txt -e 5135.eps -n 5135.ppm -t 118 -s71:76 pgm/5135.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.