Snímek 5282

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 20:24:38
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5282.pgm)
# Focal length : 19.2mm  (35mm equivalent: 130mm)
# CCD width    : 5.32mm
# Exposure time: 0.001 s  (1/2000)
# 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)* 0.868
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -70   -67   -67   -68         -105    -58.1    -92.6    -74.6  
 10   -35   -32   -32   -34        -52.5    -27.8    -46.3    -36.4  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    35    32    32    33         52.5     27.8     45.0     36.4  
 99    70    67    67    69          105     58.1     94.0     74.6  
100  7861 11074 11585 13699         1.18E4   9.83E3   1.87E4   1.05E4
# flux from 0.0580*0.49 sr ( 7.57E-8 sr/4px) is  0.0125 lx ( 0.0243 lx tilewise);
# tilewise luminance  0.291 cd/m2 with rel. SD 1.56E3 % (summing pixels below 15850 and with non-zero green: there is 48.6 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=   0.3  minimum= -154  maximum= 7861   over 15850:   0 zero: 46.4 %
# GrUp average=   0.5  minimum= -139  maximum=11074   over 15850:   0 zero: 51.8 %
# GrDw average=   0.5  minimum= -147  maximum=11585   over 15850:   0 zero: 51.0 %
# Blue average=   0.2  minimum= -143  maximum=13699   over 15850:   0 zero: 48.8 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5276.pgm -nh -nt -i 5282.txt -t 118 -s71:76 pgm/5282.pgm

Just points with luminances over 5.0E2 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:26 20:24:38
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5282.pgm)
# Focal length : 19.2mm  (35mm equivalent: 130mm)
# CCD width    : 5.32mm
# Exposure time: 0.001 s  (1/2000)
# 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)* 0.868
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -70   -67   -67   -68         -105    -58.1    -92.6    -74.6  
 10   -35   -32   -32   -34        -52.5    -27.8    -46.3    -36.4  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    35    32    32    33         52.5     27.8     45.0     36.4  
 99    70    67    67    69          105     58.1     94.0     74.6  
100 13699 13699 13699 13699         2.06E4   1.19E4   1.87E4   1.49E4
# flux from 4.84E-6 sr ( 7.57E-8 sr/4px) is  0.0119 lx (points with luminances over  5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=1864.3  minimum= -122  maximum= 7861   over 15850: 766048 zero:  1.6 %
# GrUp average=2646.3  minimum= -124  maximum=11074   over 15850: 766048
# GrDw average=2664.2  minimum= -131  maximum=11585   over 15850: 766048
# Blue average=1439.5  minimum= -112  maximum=13699   over 15850: 766048 zero:  1.6 %

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5276.pgm -sm100 -nh -L500 -i 5282.txt -e 5282.eps -n 5282.ppm -t 118 -s71:76 pgm/5282.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.