Snímek 5268


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    : 2006:02:26 20:01:48
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5268.pgm)
# Focal length : 19.2mm  (35mm equivalent: 130mm)
# CCD width    : 5.32mm
# Exposure time: 0.125 s  (1/8)
# Aperture     : f/3.2
# ISO equiv.   : 200

# Selected image percentils         L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.00347
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -69   -65   -65   -67        -0.414   -0.226   -0.365   -0.292 
 10   -33   -30   -30   -32        -0.198   -0.104   -0.174   -0.137 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    40    40    39    38         0.240    0.137    0.207    0.173 
 99    81    85    85    78         0.486    0.295    0.425    0.362 
100 15869 15866 15866 15867         95.3     55.1     86.5     69.2  
# flux from 0.0580*0.55 sr ( 7.57E-8 sr/4px) is  0.00125 lx ( 0.00222 lx tilewise);
# tilewise luminance  0.0365 cd/m2 with rel. SD  254 % (summing pixels below 15850 and with non-zero green: there is 55.4 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=   8.2  minimum= -154  maximum=15869   over 15850: 106 zero: 41.8 %
# GrUp average=  11.2  minimum= -137  maximum=15866   over 15850: 151 zero: 44.7 %
# GrDw average=  11.1  minimum= -140  maximum=15866   over 15850: 142 zero: 44.6 %
# Blue average=   7.2  minimum= -141  maximum=15867   over 15850:  75 zero: 44.1 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5276.pgm -nh -nt -i 5268.txt -t 118 -s71:76 pgm/5268.pgm

Just points with luminances over 2.5 and below 40 cd/m². In grid tiles, flux densities from these points and tiles are given.

# Date/Time    : 2006:02:26 20:01:48
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5268.pgm)
# Focal length : 19.2mm  (35mm equivalent: 130mm)
# CCD width    : 5.32mm
# Exposure time: 0.125 s  (1/8)
# Aperture     : f/3.2
# ISO equiv.   : 200


# Selected image percentils         L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 0.00347
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -69   -65   -65   -67        -0.414   -0.226   -0.365   -0.292 
 10   -33   -30   -30   -32        -0.198   -0.104   -0.174   -0.137 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    40    40    39    38         0.240    0.137    0.207    0.173 
 99    81    85    85    78         0.486    0.295    0.425    0.362 
100 15869 15866 15869 15869         95.3     55.1     86.5     69.2  
# flux from 4.04E-5 sr ( 7.57E-8 sr/4px) is  3.38E-4 lx (points with luminances over  2.5    and below   40   )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=2350.2  minimum= -122  maximum=15869   over 15850: 765516
# GrUp average=2522.4  minimum= -133  maximum=15866   over 15850: 765561
# GrDw average=2683.3  minimum= -126  maximum=15866   over 15850: 765552
# Blue average=1765.2  minimum= -138  maximum=15867   over 15850: 765485

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5276.pgm -sm100 -nh -L2.5 -U40 -i 5268.txt -e 5268.eps -n 5268.ppm -t 118 -s71:76 pgm/5268.pgm

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.