Snímek 5150

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 21:34:34
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5150.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 2.000 s 
# 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)* 1.66E-4
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1    93   137   137    74         0.0267   0.0228   0.0193   0.0241
 10   308   426   427   220         0.0885   0.0708   0.0574   0.0770
 50   647   929   929   558         0.186    0.154    0.146    0.165 
 90  8158 12183 12202  6912         2.34     2.03     1.80     2.14  
 99 15869 15866 15866 15867         4.56     2.64     4.14     3.31  
100 15869 15866 15866 15867         4.56     2.64     4.14     3.31  
# flux from 0.599 sr ( 8.59E-7 sr/4px) is  0.192 lx ( 0.234 lx tilewise);
# tilewise luminance  0.400 cd/m2 with rel. SD  126 % (summing pixels below 15850)
# Fuji Devignetting: 1 # dark frame dark/5140.pgm subtracted from all values
# Red  average=1626.0  minimum=  -76  maximum=15869   over 15850: 41207
# GrUp average=1886.0  minimum=  -39  maximum=15866   over 15850: 61883
# GrDw average=1886.8  minimum=  -62  maximum=15866   over 15850: 61911
# Blue average=1617.5  minimum=  -69  maximum=15867   over 15850: 26493

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5140.pgm -nh -nt -i 5150.txt -t 118 -s71:76 pgm/5150.pgm

Just points with luminances over 0.30 and below 1.0 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:24 21:34:34
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5150.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 2.000 s 
# 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)* 1.66E-4
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1    93   137   137    74         0.0267   0.0228   0.0193   0.0241
 10   308   426   427   220         0.0885   0.0708   0.0574   0.0770
 50   647   929   929   558         0.186    0.154    0.146    0.165 
 90  8158 12183 12202  6912         2.34     2.03     1.80     2.14  
 99 15869 15866 15866 15867         4.56     2.64     4.14     3.31  
100 15869 15866 15866 15869         4.56     2.64     4.14     3.31  
# flux from 0.101 sr ( 8.59E-7 sr/4px) is  0.0515 lx (points with luminances over  0.30   and below  1.0   )
# Fuji Devignetting: 1 # dark frame dark/5140.pgm subtracted from all values
# Red  average=3696.2  minimum=  -63  maximum=15869   over 15850: 624804
# GrUp average=3176.3  minimum=  -31  maximum=15866   over 15850: 645480
# GrDw average=3179.0  minimum=  -61  maximum=15866   over 15850: 645508
# Blue average=4162.8  minimum=  -52  maximum=15867   over 15850: 610090

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5140.pgm -sm100 -nh -L0.3 -U1 -i 5150.txt -e 5150.eps -n 5150.ppm -t 118 -s71:76 pgm/5150.pgm

Just points with luminances below 0.30 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:24 21:34:34
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5150.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 2.000 s 
# 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)* 1.66E-4
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1    93   137   137    74         0.0267   0.0228   0.0193   0.0241
 10   308   426   427   220         0.0885   0.0708   0.0574   0.0770
 50   647   929   929   558         0.186    0.154    0.146    0.165 
 90  8158 12183 12202  6912         2.34     2.03     1.80     2.14  
 99 15869 15866 15866 15867         4.56     2.64     4.14     3.31  
100 15869 15866 15866 15867         4.56     2.64     4.14     3.31  
# flux from 0.450 sr ( 8.59E-7 sr/4px) is  0.0600 lx ( 0.0893 lx tilewise);
# tilewise luminance  0.267 cd/m2 with rel. SD  172 % (points with luminances below  0.30  )
# Fuji Devignetting: 1 # dark frame dark/5140.pgm subtracted from all values
# Red  average=1036.3  minimum=  -76  maximum=15869   out of range: 215680
# GrUp average= 826.6  minimum=  -39  maximum=15866   out of range: 236356
# GrDw average= 827.0  minimum=  -62  maximum=15866   out of range: 236384
# Blue average=1185.4  minimum=  -69  maximum=15867   out of range: 200966

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -ft -d dark/5140.pgm -sm100 -nh -U0.3 -i 5150.txt -e 5150.eps -n 5150.ppm -t 118 -s71:76 pgm/5150.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.