Snímek 5300

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 21:04:19
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5300.pgm)
# Focal length : 40.5mm  (35mm equivalent: 274mm)
# CCD width    : 5.32mm
# Exposure time: 0.033 s  (1/30)
# 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)* 0.0130
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -68   -64   -63   -66        -1.53    -0.827   -1.35    -1.07  
 10   -31   -27   -27   -30        -0.698   -0.351   -0.613   -0.473 
 50     1     2     2     0         0.0225   0.0260   0.00     0.0248
 90    72    85    86    70         1.62     1.11     1.43     1.29  
 99  1035  1657  1657   942         23.3     21.6     19.3     22.2  
100 15869 15866 15866 15867          357      207      324      259  
# flux from 0.0130*0.63 sr ( 1.70E-8 sr/4px) is  0.0124 lx ( 0.0138 lx tilewise);
# tilewise luminance  0.929 cd/m2 with rel. SD  296 % (summing pixels below 15850 and with non-zero green: there is 63.0 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=  69.5  minimum= -154  maximum=15869   over 15850:   8 zero: 35.3 %
# GrUp average= 113.8  minimum= -153  maximum=15866   over 15850:  22 zero: 37.4 %
# GrDw average= 112.6  minimum= -147  maximum=15866   over 15850:  21 zero: 36.6 %
# Blue average=  65.8  minimum= -143  maximum=15867   over 15850:   2 zero: 37.5 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5276.pgm -nh -nt -i 5300.txt -t 118 -s71:76 pgm/5300.pgm

Just points with luminances over 2.0 and below 60 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:26 21:04:19
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5300.pgm)
# Focal length : 40.5mm  (35mm equivalent: 274mm)
# CCD width    : 5.32mm
# Exposure time: 0.033 s  (1/30)
# 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)* 0.0130
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -68   -64   -63   -66        -1.53    -0.827   -1.35    -1.07  
 10   -31   -27   -27   -30        -0.698   -0.351   -0.613   -0.473 
 50     1     2     2     0         0.0225   0.0260   0.00     0.0248
 90    72    85    86    70         1.62     1.11     1.43     1.29  
 99  1035  1658  1657   942         23.3     21.6     19.3     22.2  
100 15869 15869 15869 15867          357      207      324      259  
# flux from 0.00101 sr ( 1.70E-8 sr/4px) is  0.0109 lx (points with luminances over  2.0    and below   60   )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average= 513.7  minimum= -133  maximum=15869   over 15850: 706800
# GrUp average= 811.4  minimum= -133  maximum=15866   over 15850: 706814
# GrDw average= 811.2  minimum= -139  maximum=15866   over 15850: 706813
# Blue average= 464.9  minimum= -143  maximum=15867   over 15850: 706794

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5276.pgm -sm100 -nh -L2 -U60 -i 5300.txt -e 5300.eps -n 5300.ppm -t 118 -s71:76 pgm/5300.pgm

Just points with luminances below 2.0 and with non-zero green: there is 59.9 % of them cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:26 21:04:19
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5300.pgm)
# Focal length : 40.5mm  (35mm equivalent: 274mm)
# CCD width    : 5.32mm
# Exposure time: 0.033 s  (1/30)
# 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)* 0.0130
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -68   -64   -63   -66        -1.53    -0.827   -1.35    -1.07  
 10   -31   -27   -27   -30        -0.698   -0.351   -0.613   -0.473 
 50     1     2     2     0         0.0225   0.0260   0.00     0.0248
 90    72    85    86    70         1.62     1.11     1.43     1.29  
 99  1035  1657  1657   942         23.3     21.6     19.3     22.2  
100 15869 15866 15866 15867          357      207      324      259  
# flux from 0.0120*0.60 sr ( 1.70E-8 sr/4px) is  0.00131 lx ( 0.00201 lx tilewise);
# tilewise luminance  0.209 cd/m2 with rel. SD  160 % (points with luminances below  2.0    and with non-zero green: there is 59.9 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=   8.5  minimum= -154  maximum=15869   out of range: 59412 zero: 38.3 %
# GrUp average=  14.0  minimum= -153  maximum=15866   out of range: 59426 zero: 40.6 %
# GrDw average=  14.0  minimum= -147  maximum=15866   out of range: 59425 zero: 39.7 %
# Blue average=   9.0  minimum= -143  maximum=15867   out of range: 59406 zero: 40.7 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -ft -d dark/5276.pgm -sm100 -nh -U2 -i 5300.txt -e 5300.eps -n 5300.ppm -t 118 -s71:76 pgm/5300.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.