Image 32
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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 01:11:01
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/32.pgm)
# Focal length : 23.4mm
# Exposure time: 0.250 s (1/4)
# 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 -0.145 -0.153 -0.217 -0.210 -0.123
10 -20 -20 -26 -22 -0.0762 -0.0808 -0.123 -0.110 -0.0622
50 0 0 0 0 0.00 0.00 0.00 0.00 0.00
90 22 22 26 24 0.0838 0.0888 0.123 0.120 0.0721
99 44 42 50 46 0.168 0.170 0.236 0.230 0.147
100 16322 16320 16320 16320 62.2 65.9 77.1 81.4 57.7
# flux from 0.0680 sr ( 8.61E-8 sr/4px) is 7.11E-4 lx;
# tilewise luminance 0.00981 cd/m2 with rel. SD 415 % (summing pixels below 16380)
# dark frame dark/off.pgm subtracted from all values
# Yell average= 2.7 minimum= -80 maximum=16322 over 16380: 90
# Cyan average= 2.4 minimum= -88 maximum=16320 over 16380: 108
# Gree average= 1.8 minimum= -102 maximum=16320 over 16380: 125
# Mage average= 3.2 minimum= -88 maximum=16320 over 16380: 102
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 32.txt -e 32.eps -n 32.ppm -t168 -c 3412 -s64 pgm/32.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 01:11:01
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/32.pgm)
# Focal length : 23.4mm
# Exposure time: 0.250 s (1/4)
# 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 -0.145 -0.153 -0.217 -0.210 -0.123
10 -20 -20 -26 -22 -0.0762 -0.0808 -0.123 -0.110 -0.0622
50 0 0 0 0 0.00 0.00 0.00 0.00 0.00
90 22 22 26 24 0.0838 0.0888 0.123 0.120 0.0721
99 44 42 50 46 0.168 0.170 0.236 0.230 0.147
100 16322 16320 16320 16320 62.2 65.9 77.1 81.4 57.7
# flux from 3.52E-5 sr ( 8.61E-8 sr/4px) is 2.90E-4 lx;
# tilewise luminance 0.500 cd/m2 with rel. SD 444 % (points with luminances over 1.5 and below 50 )
# dark frame dark/off.pgm subtracted from all values
# Yell average=2367.4 minimum= -80 maximum=16322 out of range: 794172
# Cyan average=2949.4 minimum= -88 maximum=16320 out of range: 794190
# Gree average=2346.1 minimum= -102 maximum=16320 out of range: 794207
# Mage average=3210.9 minimum= -88 maximum=16320 out of range: 794184
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 32.txt -e 32.eps -n 32.ppm -t168 -c 3412 -s64 pgm/32.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)
