Image 34
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| | original | colour coded
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and with an inserted data grid:
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(in the middle of tiles, median of raw G-pixels values is given,
the bottom value is the tile luminance divided
by one candela per square meter).
# Date/Time : 2005:08:05 01:12:45
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/34.pgm)
# Focal length : 23.4mm
# Exposure time:60.120 s
# Aperture : f/4.0
# ISO equiv. : 100
#c li count min Yav max ovf min Cav max ovf min Gav max ovf min Mav max ovf
# % Y C G M readings Y C G M L / cd/m2
1 11 0 -8 -3 1.74E-4 0.00 -1.57E-4 -6.22E-5 2.74E-4
10 41 27 23 25 6.49E-4 4.53E-4 4.52E-4 5.19E-4 7.09E-4
50 91 67 68 69 0.00144 0.00113 0.00134 0.00143 0.00147
90 359 264 251 248 0.00569 0.00443 0.00493 0.00515 0.00591
99 4260 2951 2761 2783 0.0675 0.0496 0.0542 0.0578 0.0715
100 16311 16312 16312 16304 0.258 0.274 0.320 0.338 0.240
# flux from 0.0678 sr ( 8.61E-8 sr/4px) is 2.73E-4 lx;
# tilewise luminance 0.00368 cd/m2 with rel. SD 229 % (summing pixels below 16380)
# dark frame dark/1m.pgm subtracted from all values
# Yell average= 245.0 minimum= -512 maximum=16311 over 16380: 1285
# Cyan average= 179.9 minimum= -481 maximum=16312 over 16380: 1368
# Gree average= 175.5 minimum= -512 maximum=16312 over 16380: 1808
# Mage average= 176.7 minimum= -512 maximum=16304 over 16380: 1473
End of results of "raw2lum" (version 1.22) with parameters:
-c YCGM -fa -w 7.3 -fc1.03 -o 16380 -d dark/1m.pgm -sm200 -nh -i 34.txt -e 34.eps -n 34.ppm -t168 -c 3412 -s64 pgm/34.pgm
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Just points with luminances below 0.20 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2005:08:05 01:12:45
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/34.pgm)
# Focal length : 23.4mm
# Exposure time:60.120 s
# Aperture : f/4.0
# ISO equiv. : 100
#c li count min Yav max ovf min Cav max ovf min Gav max ovf min Mav max ovf
# % Y C G M readings Y C G M L / cd/m2
1 11 0 -8 -3 1.74E-4 0.00 -1.57E-4 -6.22E-5 2.74E-4
10 41 27 23 25 6.49E-4 4.53E-4 4.52E-4 5.19E-4 7.09E-4
50 91 67 68 69 0.00144 0.00113 0.00134 0.00143 0.00147
90 359 264 251 248 0.00569 0.00443 0.00493 0.00515 0.00591
99 4260 2951 2761 2783 0.0675 0.0496 0.0542 0.0578 0.0715
100 16311 16312 16312 16304 0.258 0.274 0.320 0.338 0.240
# flux from 0.0677 sr ( 8.61E-8 sr/4px) is 2.56E-4 lx;
# tilewise luminance 0.00349 cd/m2 with rel. SD 214 % (points with luminances below 0.20 )
# dark frame dark/1m.pgm subtracted from all values
# Yell average= 230.3 minimum= -512 maximum=16311 out of range: 2145
# Cyan average= 169.5 minimum= -481 maximum=16312 out of range: 2228
# Gree average= 166.0 minimum= -512 maximum=16312 out of range: 2668
# Mage average= 166.7 minimum= -512 maximum=16304 out of range: 2333
End of results of "raw2lum" (version 1.22) with parameters:
-c YCGM -ft -w 7.3 -fc1.03 -o 16380 -U0.2 -d dark/1m.pgm -sm200 -nh -i 34.txt -e 34.eps -n 34.ppm -t168 -c 3412 -s64 pgm/34.pgm
Logarithmic luminance scale (the unit is candela per square meter)
– intensities of snow illuminance in lux would be obtained by
multiplying the numeric value of luminance by 3.6. For asphalt,
such a coefficient is between 20 and 40
(or much less, for specular reflection of distant lamps)
