Snímek 5240


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 18:21:59
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5240.pgm)
# Focal length :  7.5mm  (35mm equivalent: 51mm)
# CCD width    : 5.32mm
# Exposure time: 0.001 s  (1/2000)
# Aperture     : f/8.0
# ISO equiv.   : 200

# Selected image percentils         L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 5.42
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -69   -70         -666     -372     -596     -475  
 10   -37   -33   -34   -35         -347     -182     -298     -240  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    28    25    25    26          263      136      221      180  
 99    57    54    54    55          535      293      468      378  
100 15869 15845 15866 15833         1.49E5   8.60E4   1.35E5   1.08E5
# flux from 0.379*0.47 sr ( 4.96E-7 sr/4px) is -5.65 lx (-10.8 lx tilewise);
# tilewise luminance -31.9 cd/m2 with rel. SD -172 % (summing pixels below 15850 and with non-zero green: there is 47.5 % of them)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red  average=  -4.5  minimum= -160  maximum=15869   over 15850:   3 zero: 46.9 %
# GrUp average=  -3.7  minimum= -140  maximum=15845   over 15850:   2 zero: 52.6 %
# GrDw average=  -4.5  minimum= -152  maximum=15866   over 15850:   3 zero: 52.4 %
# Blue average=  -5.4  minimum= -170  maximum=15833   over 15850:   1 zero: 49.9 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5238.pgm -nh -nt -i 5240.txt -t 118 -s71:76 pgm/5240.pgm

Colour scale begins at 0.4 mcd/m² instead of at 0.04 mcd/m². Just points with luminances over 5.0E3 cd/m². In grid tiles, flux densities from these points and tiles are given.

# Date/Time    : 2006:02:26 18:21:59
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5240.pgm)
# Focal length :  7.5mm  (35mm equivalent: 51mm)
# CCD width    : 5.32mm
# Exposure time: 0.001 s  (1/2000)
# Aperture     : f/8.0
# ISO equiv.   : 200


# Selected image percentils         L=(1.730*0.35*R+1.000*0.65*G+1.570*0.00*B)* 5.42
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -69   -70         -666     -372     -596     -475  
 10   -37   -33   -34   -35         -347     -182     -298     -240  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    28    25    25    26          263      136      221      180  
 99    57    54    54    55          535      293      468      378  
100 15869 15845 15866 15869         1.49E5   8.60E4   1.35E5   1.08E5
# flux from 9.06E-5 sr ( 4.96E-7 sr/4px) is  1.44   lx (points with luminances over  5.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red  average=2182.7  minimum= -127  maximum=15869   over 15850: 765926
# GrUp average=2737.7  minimum= -137  maximum=15845   over 15850: 765925
# GrDw average=2586.5  minimum= -122  maximum=15866   over 15850: 765926
# Blue average=1039.6  minimum= -155  maximum=15833   over 15850: 765924

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5238.pgm -sm100 -nh -L5000 -BL0.4 -i 5240.txt -e 5240.eps -n 5240.ppm -t 118 -s71:76 pgm/5240.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.