Snímek 5279


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 20:22:38
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5279.pgm)
# Focal length : 19.2mm  (35mm equivalent: 130mm)
# 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   -68   -65   -65   -67        -0.408   -0.226   -0.365   -0.290 
 10   -33   -29   -29   -32        -0.198   -0.101   -0.174   -0.135 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    43    44    44    41         0.258    0.153    0.223    0.190 
 99   101   136   136    94         0.607    0.472    0.512    0.519 
100 15869 15866 15866 15867         95.3     55.1     86.5     69.2  
# flux from 0.0580*0.58 sr ( 7.57E-8 sr/4px) is  0.00360 lx ( 0.00542 lx tilewise);
# tilewise luminance  0.0849 cd/m2 with rel. SD  517 % (summing pixels below 15850 and with non-zero green: there is 58.0 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=  22.1  minimum= -151  maximum=15869   over 15850: 169 zero: 40.0 %
# GrUp average=  31.5  minimum= -144  maximum=15866   over 15850: 299 zero: 42.3 %
# GrDw average=  30.9  minimum= -147  maximum=15866   over 15850: 303 zero: 41.6 %
# Blue average=  21.0  minimum= -137  maximum=15867   over 15850: 104 zero: 42.2 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5276.pgm -nh -nt -i 5279.txt -t 118 -s71:76 pgm/5279.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 20:22:38
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5279.pgm)
# Focal length : 19.2mm  (35mm equivalent: 130mm)
# 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   -68   -65   -65   -67        -0.408   -0.226   -0.365   -0.290 
 10   -33   -29   -29   -32        -0.198   -0.101   -0.174   -0.135 
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    43    44    44    41         0.258    0.153    0.223    0.190 
 99   101   136   136    94         0.607    0.472    0.512    0.519 
100 15869 15869 15869 15869         95.3     55.1     86.5     69.2  
# flux from 1.43E-4 sr ( 7.57E-8 sr/4px) is  0.00159 lx (points with luminances over  2.5    and below   40   )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=2611.7  minimum= -120  maximum=15869   over 15850: 764037
# GrUp average=3350.6  minimum= -136  maximum=15866   over 15850: 764167
# GrDw average=3308.4  minimum= -108  maximum=15866   over 15850: 764171
# Blue average=2299.0  minimum= -115  maximum=15867   over 15850: 763972

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5276.pgm -sm100 -nh -L2.5 -U40 -i 5279.txt -e 5279.eps -n 5279.ppm -t 118 -s71:76 pgm/5279.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.