Snímek 5147

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 20:36:04
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5147.pgm)
# Focal length : 12.0mm  (35mm equivalent: 81mm)
# 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   -68   -64   -64   -67        -0.313   -0.170   -0.280   -0.220 
 10   -30   -26   -26   -29        -0.138   -0.0691  -0.121   -0.0932
 50     5     8     9     4         0.0230   0.0226   0.0167   0.0227
 90    77    97    99    71         0.354    0.260    0.296    0.293 
 99  1382  2092  2110  1024         6.35     5.58     4.27     5.85  
100 15869 15866 15866 15867         73.0     42.2     66.2     52.9  
# flux from 0.148*0.69 sr ( 1.94E-7 sr/4px) is  0.0380 lx ( 0.0425 lx tilewise);
# tilewise luminance  0.251 cd/m2 with rel. SD  312 % (summing pixels below 15850 and with non-zero green: there is 69.2 % of them)
# Fuji Devignetting: 2 # dark frame dark/5154.pgm subtracted from all values
# Red  average=  89.0  minimum= -162  maximum=15869   over 15850: 125 zero: 31.2 %
# GrUp average= 136.8  minimum= -140  maximum=15866   over 15850: 167 zero: 31.3 %
# GrDw average= 135.9  minimum= -145  maximum=15866   over 15850: 171 zero: 30.4 %
# Blue average=  70.0  minimum= -141  maximum=15867   over 15850: 200 zero: 33.2 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5154.pgm -nh -nt -i 5147.txt -t 118 -s71:76 pgm/5147.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 20:36:04
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5147.pgm)
# Focal length : 12.0mm  (35mm equivalent: 81mm)
# 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   -68   -64   -64   -67        -0.313   -0.170   -0.280   -0.220 
 10   -30   -26   -26   -29        -0.138   -0.0691  -0.121   -0.0932
 50     5     8     9     4         0.0230   0.0226   0.0167   0.0227
 90    77    97    99    71         0.354    0.260    0.296    0.293 
 99  1383  2092  2111  1024         6.36     5.59     4.27     5.86  
100 15869 15869 15869 15869         73.0     42.2     66.2     52.9  
# flux from 0.00737 sr ( 1.94E-7 sr/4px) is  0.0295 lx (points with luminances over  1.0    and below   25   )
# Fuji Devignetting: 2 # dark frame dark/5154.pgm subtracted from all values
# Red  average= 961.3  minimum= -139  maximum=15869   over 15850: 727947
# GrUp average=1467.2  minimum= -120  maximum=15866   over 15850: 727989
# GrDw average=1468.4  minimum= -120  maximum=15866   over 15850: 727993
# Blue average= 708.3  minimum= -119  maximum=15867   over 15850: 728022

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5154.pgm -sm100 -nh -L1 -U25 -i 5147.txt -e 5147.eps -n 5147.ppm -t 118 -s71:76 pgm/5147.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.