Snímek 5143

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 20:30:23
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5143.pgm)
# Focal length : 13.6mm  (35mm equivalent: 92mm)
# CCD width    : 5.32mm
# Exposure time: 0.008 s  (1/125)
# 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)* 0.0542
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -69   -70        -6.66    -3.72    -5.96    -4.75  
 10   -36   -33   -33   -35        -3.38    -1.79    -2.98    -2.35  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    35    32    33    34         3.28     1.76     2.90     2.30  
 99    71    67    68    69         6.66     3.66     5.88     4.71  
100 15869 15866 15866  7310         1.49E3    861      622     1.08E3
# flux from 0.116*0.49 sr ( 1.51E-7 sr/4px) is  0.00129 lx ( 0.00281 lx tilewise);
# tilewise luminance -2.04E-4 cd/m2 with rel. SD-1.14E5 % (summing pixels below 15850 and with non-zero green: there is 49.0 % of them)
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red  average=   0.3  minimum= -151  maximum=15869   over 15850:   3 zero: 46.3 %
# GrUp average=   0.4  minimum= -156  maximum=15866   over 15850:   4 zero: 51.8 %
# GrDw average=   0.5  minimum= -149  maximum=15866   over 15850:   3 zero: 50.1 %
# Blue average=  -0.1  minimum= -150  maximum= 7310   over 15850:   0 zero: 48.5 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5119.pgm -nh -nt -i 5143.txt -t 118 -s71:76 pgm/5143.pgm

Just points with luminances over 25 and below 5.0E2 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:24 20:30:23
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5143.pgm)
# Focal length : 13.6mm  (35mm equivalent: 92mm)
# CCD width    : 5.32mm
# Exposure time: 0.008 s  (1/125)
# 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)* 0.0542
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -69   -70        -6.66    -3.72    -5.96    -4.75  
 10   -36   -33   -33   -35        -3.38    -1.79    -2.98    -2.35  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    35    32    33    34         3.28     1.76     2.90     2.30  
 99    71    67    68    69         6.66     3.66     5.88     4.71  
100 15869 15869 15869 15869         1.49E3    861     1.35E3   1.08E3
# flux from 2.16E-5 sr ( 1.51E-7 sr/4px) is  0.00150 lx (points with luminances over   25    and below  5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red  average=1088.0  minimum= -137  maximum=15869   over 15850: 765968 zero:  1.4 %
# GrUp average=1041.1  minimum= -133  maximum=15866   over 15850: 765969
# GrDw average=1140.9  minimum= -140  maximum=15866   over 15850: 765968 zero:  4.9 %
# Blue average= 330.0  minimum= -128  maximum= 7310   over 15850: 765965 zero:  3.4 %

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5119.pgm -sm100 -nh -L25 -U500 -i 5143.txt -e 5143.eps -n 5143.ppm -t 118 -s71:76 pgm/5143.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.