Snímek 5144
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| | původní | zesvětlený | barevně kódovaný
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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 20:30:34
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5144.pgm)
# Focal length : 13.6mm (35mm equivalent: 92mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.868
# % R G1 G2 B readings R G B L / cd/m2
1 -72 -68 -69 -70 -108 -59.4 -95.4 -76.5
10 -36 -33 -34 -35 -54.0 -29.1 -47.7 -37.8
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 52.5 28.2 46.3 36.7
99 70 66 67 69 105 57.7 94.0 74.3
100 2809 3140 2311 396 4.22E3 2.37E3 540 3.01E3
# flux from 0.116*0.48 sr ( 1.51E-7 sr/4px) is -0.0470 lx (-0.0941 lx tilewise);
# tilewise luminance -1.13 cd/m2 with rel. SD -183 % (summing pixels below 15850 and with non-zero green: there is 48.2 % of them)
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red average= -0.7 minimum= -145 maximum= 2809 over 15850: 0 zero: 46.8 %
# GrUp average= -0.8 minimum= -156 maximum= 3140 over 15850: 0 zero: 52.4 %
# GrDw average= -0.8 minimum= -144 maximum= 2311 over 15850: 0 zero: 51.2 %
# Blue average= -0.7 minimum= -154 maximum= 396 over 15850: 0 zero: 49.3 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5144.txt -t 118 -s71:76 pgm/5144.pgm
Just points with luminances over 5.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2006:02:24 20:30:34
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5144.pgm)
# Focal length : 13.6mm (35mm equivalent: 92mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.868
# % R G1 G2 B readings R G B L / cd/m2
1 -71 -68 -69 -70 -107 -59.4 -95.4 -75.9
10 -36 -33 -34 -35 -54.0 -29.1 -47.7 -37.8
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 52.5 28.2 46.3 36.7
99 70 66 67 69 105 57.7 94.0 74.3
100 3140 3140 3140 3140 4.71E3 2.72E3 4.28E3 3.42E3
# flux from 7.54E-7 sr ( 1.51E-7 sr/4px) is 9.69E-4 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red average=1236.0 minimum= -123 maximum= 2809 over 15850: 766107
# GrUp average=1090.0 minimum= -122 maximum= 3140 over 15850: 766107
# GrDw average=1187.0 minimum= -116 maximum= 2311 over 15850: 766107
# Blue average= 153.2 minimum= -127 maximum= 396 over 15850: 766107
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L500 -i 5144.txt -e 5144.eps -n 5144.ppm -t 118 -s71:76 pgm/5144.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.
