Snímek 5284


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 20:25:00
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5284.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    45    45    46    43         0.270    0.158    0.234    0.197 
 99   205   324   322   174         1.23     1.12     0.948    1.16  
100 15869 15866 15866 15867         95.3     55.1     86.5     69.2  
# flux from 0.0580*0.57 sr ( 7.57E-8 sr/4px) is  0.00374 lx ( 0.00504 lx tilewise);
# tilewise luminance  0.0772 cd/m2 with rel. SD  404 % (summing pixels below 15850 and with non-zero green: there is 57.2 % of them)
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=  20.6  minimum= -150  maximum=15869   over 15850: 164 zero: 40.1 %
# GrUp average=  32.1  minimum= -145  maximum=15866   over 15850: 201 zero: 43.1 %
# GrDw average=  32.1  minimum= -147  maximum=15866   over 15850: 197 zero: 42.4 %
# Blue average=  18.9  minimum= -143  maximum=15867   over 15850: 123 zero: 42.6 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5276.pgm -nh -nt -i 5284.txt -t 118 -s71:76 pgm/5284.pgm

Just points with luminances over 2.5 and below 30 cd/m². In grid tiles, flux densities from these points and tiles are given.

# Date/Time    : 2006:02:26 20:25:00
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5284.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    45    45    46    43         0.270    0.158    0.234    0.197 
 99   205   324   322   174         1.23     1.12     0.948    1.16  
100 15869 15866 15866 15867         95.3     55.1     86.5     69.2  
# flux from 2.55E-4 sr ( 7.57E-8 sr/4px) is  0.00171 lx (points with luminances over  2.5    and below   30   )
# Fuji Devignetting: 2 # dark frame dark/5276.pgm subtracted from all values
# Red  average=1322.9  minimum= -134  maximum=15869   over 15850: 762667
# GrUp average=1937.3  minimum= -111  maximum=15866   over 15850: 762704
# GrDw average=1983.9  minimum= -147  maximum=15866   over 15850: 762700
# Blue average=1156.9  minimum= -125  maximum=15867   over 15850: 762626

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5276.pgm -sm100 -nh -L2.5 -U30 -i 5284.txt -e 5284.eps -n 5284.ppm -t 118 -s71:76 pgm/5284.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.