Snímek 5145
| 
| 
| | 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 20:35:41
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5145.pgm)
# Focal length : 12.0mm (35mm equivalent: 81mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.664
# % R G1 G2 B readings R G B L / cd/m2
1 -72 -68 -69 -70 -82.8 -45.5 -73.0 -58.5
10 -36 -33 -34 -35 -41.4 -22.3 -36.5 -29.0
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 40.2 21.6 35.5 28.1
99 70 67 67 69 80.5 44.5 72.0 57.1
100 15869 15866 15866 15867 1.82E4 1.05E4 1.66E4 1.32E4
# flux from 0.148*0.49 sr ( 1.94E-7 sr/4px) is -0.0218 lx (-0.0369 lx tilewise);
# tilewise luminance -0.548 cd/m2 with rel. SD -511 % (summing pixels below 15850 and with non-zero green: there is 48.5 % of them)
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red average= -0.3 minimum= -151 maximum=15869 over 15850: 4 zero: 46.6 %
# GrUp average= -0.1 minimum= -140 maximum=15866 over 15850: 6 zero: 52.0 %
# GrDw average= -0.4 minimum= -149 maximum=15866 over 15850: 5 zero: 51.0 %
# Blue average= -0.4 minimum= -154 maximum=15867 over 15850: 4 zero: 49.0 %
End of results of "raw2lum" (version 1.22) with parameters:
-c fuji -fa -d dark/5119.pgm -nh -nt -i 5145.txt -t 118 -s71:76 pgm/5145.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 20:35:41
# Resolution : 1280 x 960 in jpeg (1424x1076 in pgm/5145.pgm)
# Focal length : 12.0mm (35mm equivalent: 81mm)
# CCD width : 5.32mm
# Exposure time: 0.001 s (1/2000)
# 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)* 0.664
# % R G1 G2 B readings R G B L / cd/m2
1 -72 -68 -69 -70 -82.8 -45.5 -73.0 -58.5
10 -36 -33 -34 -35 -41.4 -22.3 -36.5 -29.0
50 0 0 0 0 0.00 0.00 0.00 0.00
90 35 32 33 34 40.2 21.6 35.5 28.1
99 70 67 67 69 80.5 44.5 72.0 57.1
100 15869 15866 15869 15869 1.82E4 1.05E4 1.66E4 1.32E4
# flux from 5.23E-6 sr ( 1.94E-7 sr/4px) is 0.0119 lx (points with luminances over 5.0E2 )
# Fuji Devignetting: 2 # dark frame dark/5119.pgm subtracted from all values
# Red average=2990.2 minimum= -118 maximum=15869 over 15850: 766079
# GrUp average=3565.3 minimum= -133 maximum=15866 over 15850: 766081
# GrDw average=2555.8 minimum= -142 maximum=15866 over 15850: 766080
# Blue average=2038.0 minimum= -128 maximum=15867 over 15850: 766079
End of results of "raw2lum" (version 1.21) with parameters:
-c fuji -ft -d dark/5119.pgm -sm100 -nh -L500 -i 5145.txt -e 5145.eps -n 5145.ppm -t 118 -s71:76 pgm/5145.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.
