Snímek 5134

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 20:14:18
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5134.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.002 s  (1/400)
# 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)* 0.133
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -69   -70        -16.3    -9.10    -14.6    -11.6  
 10   -36   -33   -34   -35        -8.28    -4.45    -7.30    -5.79  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    33    34    34         8.28     4.45     7.09     5.79  
 99    72    68    69    70         16.6     9.10     14.6     11.7  
100 16241 16269 16276 16277         3.73E3   2.16E3   3.40E3   2.71E3
# flux from 0.654*0.49 sr ( 8.59E-7 sr/4px) is  0.0143 lx ( 0.0416 lx tilewise);
# tilewise luminance  0.0150 cd/m2 with rel. SD 4.49E3 % (summing pixels below 15850 and with non-zero green: there is 48.8 % of them)
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=   0.4  minimum= -147  maximum=16241   over 15850:   3 zero: 46.3 %
# GrUp average=   0.1  minimum= -156  maximum=16269   over 15850:   8 zero: 52.1 %
# GrDw average=   0.5  minimum= -149  maximum=16276   over 15850:   7 zero: 50.3 %
# Blue average=   0.3  minimum= -148  maximum=16277   over 15850:   4 zero: 48.7 %

End of results of "raw2lum" (version 1.22) with parameters:
  -c fuji -fa -d dark/5119.pgm -nh -nt -i 5134.txt -t 118 -s71:76 pgm/5134.pgm

Just points with luminances over 25 and below 1.0E3 cd/m2. In grid tiles, flux densities from these points and tiles are given.
# Date/Time    : 2006:02:24 20:14:18
# Resolution   : 1280 x 960 in jpeg (1424x1076 in pgm/5134.pgm)
# Focal length :  5.7mm  (35mm equivalent: 39mm)
# CCD width    : 5.32mm
# Exposure time: 0.002 s  (1/400)
# 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)* 0.133
# %    R     G1    G2    B readings  R        G        B        L / cd/m2
  1   -71   -68   -69   -70        -16.3    -9.10    -14.6    -11.6  
 10   -36   -33   -34   -35        -8.28    -4.45    -7.30    -5.79  
 50     0     0     0     0         0.00     0.00     0.00     0.00  
 90    36    33    34    34         8.28     4.45     7.09     5.79  
 99    72    68    69    70         16.6     9.10     14.6     11.7  
100 16277 16277 16277 16277         3.74E3   2.16E3   3.40E3   2.71E3
# flux from 8.30E-5 sr ( 8.59E-7 sr/4px) is  0.00947 lx (points with luminances over   25    and below  1.0E3 )
# Fuji Devignetting: 1 # dark frame dark/5119.pgm subtracted from all values
# Red  average=1150.0  minimum= -118  maximum=16241   over 15850: 766008
# GrUp average= 825.8  minimum= -125  maximum=16269   over 15850: 766013
# GrDw average=1014.2  minimum= -112  maximum=16276   over 15850: 766012
# Blue average=1277.9  minimum= -133  maximum=16277   over 15850: 766009 zero:  1.9 %

End of results of "raw2lum" (version 1.21) with parameters:
  -c fuji -ft -d dark/5119.pgm -sm100 -nh -L25 -U1000 -i 5134.txt -e 5134.eps -n 5134.ppm -t 118 -s71:76 pgm/5134.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.