Snímek 5261


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 19:49:11
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5261.pgm)
# Focal length : 15.4mm  (35mm equivalent: 104mm)
# CCD width    : 5.32mm
# Exposure time: 0.125 s  (1/8)
# 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)* 0.00347
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -69   -65   -66   -68        -0.414   -0.227   -0.371   -0.293 
 10   -33   -30   -29   -32        -0.198   -0.102   -0.174   -0.136 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    41    41    42    39         0.246    0.144    0.213    0.180 
 99    79    82    82    77         0.474    0.285    0.420    0.351 
100 15869 15866 15866 15867         95.3     55.1     86.5     69.2  
# flux from 0.0901*0.57 sr ( 1.18E-7 sr/4px) is  0.00238 lx ( 0.00408 lx tilewise);
# tilewise luminance  0.0429 cd/m2 with rel. SD  214 % (summing pixels below 15850 and with non-zero green: there is 56.9 % of them)
# Fuji Devignetting: 2 # dark frame dark/5260.pgm subtracted from all values
# Red  average=   8.6  minimum= -150  maximum=15869   over 15850:   7 zero: 41.0 %
# GrUp average=  12.7  minimum= -160  maximum=15866   over 15850:  18 zero: 43.5 %
# GrDw average=  13.2  minimum= -156  maximum=15866   over 15850:  16 zero: 42.8 %
# Blue average=   7.7  minimum= -161  maximum=15867   over 15850:   3 zero: 43.5 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5260.pgm -nh -nt -i 5261.txt -t 118 -s71:76 pgm/5261.pgm

Just points with luminances over 2.5 and below 40 cd/m². In grid tiles, flux densities from these points and tiles are given.

# Date/Time    : 2006:02:26 19:49:11
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5261.pgm)
# Focal length : 15.4mm  (35mm equivalent: 104mm)
# CCD width    : 5.32mm
# Exposure time: 0.125 s  (1/8)
# 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)* 0.00347
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -69   -65   -66   -68        -0.414   -0.227   -0.371   -0.293 
 10   -33   -30   -29   -32        -0.198   -0.102   -0.174   -0.136 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    41    41    42    39         0.246    0.144    0.213    0.180 
 99    79    82    82    77         0.474    0.285    0.420    0.351 
100 15869 15866 15866 15867         95.3     55.1     86.5     69.2  
# flux from 6.58E-5 sr ( 1.18E-7 sr/4px) is  6.69E-4 lx ( 7.51E-4 lx tilewise);
# tilewise luminance  0.514 cd/m2 with rel. SD  515 % (points with luminances over  2.5    and below   40   )
# Fuji Devignetting: 2 # dark frame dark/5260.pgm subtracted from all values
# Red  average=2096.6  minimum= -150  maximum=15869   out of range: 765537
# GrUp average=2926.1  minimum= -160  maximum=15866   out of range: 765548
# GrDw average=2984.4  minimum= -156  maximum=15866   out of range: 765546
# Blue average=1588.3  minimum= -161  maximum=15867   out of range: 765533

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -ft -d dark/5260.pgm -sm100 -nh -L2.5 -U40 -i 5261.txt -e 5261.eps -n 5261.ppm -t 118 -s71:76 pgm/5261.pgm

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.