Snímek 5246

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 18:33:28
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5246.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.125 s  (1/8)
# 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)* 0.00266
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -24   -11   -10   -38        -0.110   -0.0279  -0.159   -0.0568
 10    38    54    55    10         0.175    0.145    0.0417   0.155 
 50   197   239   240   111         0.906    0.637    0.463    0.731 
 90  2033  2408  2409   980         9.35     6.40     4.09     7.43  
 99  8535  9937  9959  4024         39.2     26.4     16.8     30.9  
100 16383 16383 16383 16383         75.3     43.5     68.4     54.7  
# flux from 0.652 sr ( 8.59E-7 sr/4px) is  1.74 lx ( 1.80 lx tilewise);
# tilewise luminance  2.56 cd/m2 with rel. SD  151 % (summing pixels below 15850)
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red  average= 763.7  minimum= -144  maximum=16383   over 15850: 2057 zero:  1.1 %
# GrUp average= 896.4  minimum= -125  maximum=16383   over 15850: 2569
# GrDw average= 897.0  minimum= -110  maximum=16383   over 15850: 2556
# Blue average= 394.0  minimum= -141  maximum=16383   over 15850: 1265 zero:  3.2 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5238.pgm -nh -nt -i 5246.txt -t 118 -s71:76 pgm/5246.pgm

Just points with luminances below 40 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:26 18:33:28
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5246.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.125 s  (1/8)
# 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)* 0.00266
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -24   -11   -10   -38        -0.110   -0.0279  -0.159   -0.0568
 10    38    54    55    10         0.175    0.145    0.0417   0.155 
 50   197   239   240   111         0.906    0.637    0.463    0.731 
 90  2033  2408  2409   980         9.35     6.40     4.09     7.43  
 99  8535  9937  9959  4024         39.2     26.4     16.8     30.9  
100 16383 16383 16383 16383         75.3     43.5     68.4     54.7  
# flux from 0.651 sr ( 8.59E-7 sr/4px) is  1.70   lx (points with luminances below   40   )
# Fuji Devignetting: 1 # dark frame dark/5238.pgm subtracted from all values
# Red  average= 747.0  minimum= -144  maximum=16383   over 15850: 3167 zero:  1.1 %
# GrUp average= 877.4  minimum= -125  maximum=16383   over 15850: 3679
# GrDw average= 878.2  minimum= -110  maximum=16383   over 15850: 3666
# Blue average= 386.0  minimum= -141  maximum=16383   over 15850: 2375 zero:  3.2 %

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5238.pgm -sm100 -nh -U40 -i 5246.txt -e 5246.eps -n 5246.ppm -t 118 -s71:76 pgm/5246.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.