Image 31
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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 01:10:44
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/31.pgm)
# Focal length : 23.4mm
# Exposure time: 0.001 s (1/1000)
# 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 -38 -38 -46 -42 -36.2 -38.4 -54.3 -52.4 -30.8
10 -22 -20 -26 -22 -21.0 -20.2 -30.7 -27.4 -18.0
50 0 0 0 0 0.00 0.00 0.00 0.00 0.00
90 20 20 24 22 19.0 20.2 28.3 27.4 16.3
99 38 38 44 40 36.2 38.4 52.0 49.9 31.5
100 4334 3154 4418 2880 4.13E3 3.18E3 5.22E3 3.59E3 3.80E3
# flux from 0.0680 sr ( 8.61E-8 sr/4px) is -0.0110 lx;
# tilewise luminance -0.0106 cd/m2 with rel. SD-1.17E4 % (summing pixels below 16380)
# dark frame dark/off.pgm subtracted from all values
# Yell average= -0.3 minimum= -80 maximum= 4334 over 16380: 0
# Cyan average= -0.2 minimum= -100 maximum= 3154 over 16380: 0
# Gree average= -0.6 minimum= -102 maximum= 4418 over 16380: 0
# Mage average= -0.4 minimum= -330 maximum= 2880 over 16380: 0
End of results of "raw2lum" (version 1.22) with parameters:
-c YCGM -fa -w 7.3 -fc1.03 -o 16380 -d dark/off.pgm -sm200 -nh -i 31.txt -e 31.eps -n 31.ppm -t168 -c 3412 -s64 pgm/31.pgm
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Just points with luminances over 6.0E2 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2005:08:05 01:10:44
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/31.pgm)
# Focal length : 23.4mm
# Exposure time: 0.001 s (1/1000)
# 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 -38 -38 -46 -42 -36.2 -38.4 -54.3 -52.4 -30.8
10 -22 -20 -26 -22 -21.0 -20.2 -30.7 -27.4 -18.0
50 0 0 0 0 0.00 0.00 0.00 0.00 0.00
90 20 20 24 22 19.0 20.2 28.3 27.4 16.3
99 38 38 44 40 36.2 38.4 52.0 49.9 31.5
100 4334 3154 4418 2880 4.13E3 3.18E3 5.22E3 3.59E3 3.80E3
# flux from 2.74E-6 sr ( 8.61E-8 sr/4px) is 0.00388 lx;
# tilewise luminance 31.3 cd/m2 with rel. SD 695 % (points with luminances over 6.0E2 )
# dark frame dark/off.pgm subtracted from all values
# Yell average=1406.2 minimum= -80 maximum= 4334 out of range: 794608
# Cyan average= 964.0 minimum= -100 maximum= 3154 out of range: 794608
# Gree average= 892.1 minimum= -102 maximum= 4418 out of range: 794608
# Mage average= 632.4 minimum= -330 maximum= 2880 out of range: 794608
End of results of "raw2lum" (version 1.22) with parameters:
-c YCGM -ft -w 7.3 -fc1.03 -o 16380 -L600 -d dark/off.pgm -sm200 -nh -i 31.txt -e 31.eps -n 31.ppm -t168 -c 3412 -s64 pgm/31.pgm
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Just points with luminances over 1.5 and below 50 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2005:08:05 01:10:44
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/31.pgm)
# Focal length : 23.4mm
# Exposure time: 0.001 s (1/1000)
# 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 -38 -38 -46 -42 -36.2 -38.4 -54.3 -52.4 -30.8
10 -22 -20 -26 -22 -21.0 -20.2 -30.7 -27.4 -18.0
50 0 0 0 0 0.00 0.00 0.00 0.00 0.00
90 20 20 24 22 19.0 20.2 28.3 27.4 16.3
99 38 38 44 40 36.2 38.4 52.0 49.9 31.5
100 4334 3154 4418 2880 4.13E3 3.18E3 5.22E3 3.59E3 3.80E3
# flux from 0.0310 sr ( 8.61E-8 sr/4px) is 0.523 lx;
# tilewise luminance 17.0 cd/m2 with rel. SD 3.57 % (points with luminances over 1.5 and below 50 )
# dark frame dark/off.pgm subtracted from all values
# Yell average= 12.0 minimum= -80 maximum= 4334 out of range: 431634
# Cyan average= -0.6 minimum= -100 maximum= 3154 out of range: 431634
# Gree average= -5.8 minimum= -102 maximum= 4418 out of range: 431634
# Mage average= -0.1 minimum= -330 maximum= 2880 out of range: 431634
End of results of "raw2lum" (version 1.22) with parameters:
-c YCGM -ft -w 7.3 -fc1.03 -o 16380 -L1.5 -U50 -d dark/off.pgm -sm200 -nh -i 31.txt -e 31.eps -n 31.ppm -t168 -c 3412 -s64 pgm/31.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)
