Snímek 5115

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 19:14:40
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5115.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.003 s  (1/320)
# 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)* 0.106
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -68   -69        -13.1    -7.23    -11.5    -9.27  
 10   -36   -32   -33   -34        -6.62    -3.45    -5.67    -4.56  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    34    34    35         6.62     3.61     5.84     4.67  
 99    74    71    72    72         13.6     7.60     12.0     9.70  
100  9677 15935 15904  9352         1.78E3   1.69E3   1.56E3   1.72E3
# flux from 0.654*0.50 sr ( 8.59E-7 sr/4px) is  0.125 lx ( 0.262 lx tilewise);
# tilewise luminance  0.346 cd/m2 with rel. SD  538 % (summing pixels below 15850 and with non-zero green: there is 49.7 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=   2.3  minimum= -151  maximum= 9677   over 15850:   0 zero: 45.7 %
# GrUp average=   3.7  minimum= -137  maximum=15935   over 15850:   7 zero: 50.7 %
# GrDw average=   3.4  minimum= -146  maximum=15904   over 15850:   4 zero: 49.8 %
# Blue average=   2.0  minimum= -150  maximum= 9352   over 15850:   0 zero: 47.9 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5119.pgm -nh -nt -i 5115.txt -t 118 -s71:76 pgm/5115.pgm

Just points with luminances over 25 and below 1.0E3 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:24 19:14:40
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5115.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.003 s  (1/320)
# 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)* 0.106
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -68   -69        -13.1    -7.23    -11.5    -9.27  
 10   -36   -32   -33   -34        -6.62    -3.45    -5.67    -4.56  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    34    34    35         6.62     3.61     5.84     4.67  
 99    74    71    72    72         13.6     7.60     12.0     9.70  
100 15935 15935 15935 15935         2.93E3   1.69E3   2.66E3   2.13E3
# flux from 3.83E-4 sr ( 8.59E-7 sr/4px) is  0.0673 lx (points with luminances over   25    and below  1.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=1171.5  minimum= -127  maximum= 9677   over 15850: 765657
# GrUp average=1647.6  minimum= -114  maximum=15935   over 15850: 765664
# GrDw average=1690.1  minimum= -123  maximum=15904   over 15850: 765661
# Blue average= 988.8  minimum= -135  maximum= 9352   over 15850: 765657 zero:  1.8 %

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5119.pgm -sm100 -nh -L25 -U1000 -i 5115.txt -e 5115.eps -n 5115.ppm -t 118 -s71:76 pgm/5115.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.