Snímek 5133

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 20:14:00
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5133.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.067 s  (1/15)
# 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)* 0.00498
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -67   -68   -69        -0.612   -0.336   -0.540   -0.433 
 10   -35   -31   -32   -34        -0.302   -0.157   -0.266   -0.208 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    39    38    38    38         0.336    0.189    0.297    0.241 
 99    84    88    89    81         0.724    0.441    0.634    0.540 
100 16287 16284 16284 16285          140     81.1      127      102  
# flux from 0.654*0.53 sr ( 8.59E-7 sr/4px) is  0.0200 lx ( 0.0341 lx tilewise);
# tilewise luminance  0.0498 cd/m2 with rel. SD  371 % (summing pixels below 15850 and with non-zero green: there is 52.7 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=   7.7  minimum= -151  maximum=16287   over 15850:  32 zero: 43.4 %
# GrUp average=  11.8  minimum= -141  maximum=16284   over 15850:  40 zero: 47.5 %
# GrDw average=  11.5  minimum= -146  maximum=16284   over 15850:  38 zero: 47.0 %
# Blue average=   6.5  minimum= -143  maximum=16285   over 15850:  40 zero: 45.7 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5119.pgm -nh -nt -i 5133.txt -t 118 -s71:76 pgm/5133.pgm

Just points with luminances over 1.0 and below 25 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:24 20:14:00
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5133.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.067 s  (1/15)
# 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)* 0.00498
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -67   -68   -69        -0.612   -0.336   -0.540   -0.433 
 10   -35   -31   -32   -34        -0.302   -0.157   -0.266   -0.208 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    39    38    38    38         0.336    0.189    0.297    0.241 
 99    84    88    89    81         0.724    0.441    0.634    0.540 
100 16287 16284 16287 16287          140     81.2      127      102  
# flux from 0.00296 sr ( 8.59E-7 sr/4px) is  0.0120 lx (points with luminances over  1.0    and below   25   )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average= 581.4  minimum= -141  maximum=16287   over 15850: 762623
# GrUp average= 838.6  minimum= -126  maximum=16284   over 15850: 762631
# GrDw average= 841.7  minimum= -134  maximum=16284   over 15850: 762629
# Blue average= 444.7  minimum= -135  maximum=16285   over 15850: 762631 zero:  1.3 %

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5119.pgm -sm100 -nh -L1 -U25 -i 5133.txt -e 5133.eps -n 5133.ppm -t 118 -s71:76 pgm/5133.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.