Image 33
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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 01:11:21
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/33.pgm)
# Focal length : 23.4mm
# Exposure time: 8.000 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 -28 -30 -39 -34 -0.00333 -0.00379 -0.00576 -0.00530 -0.00261
10 -10 -12 -17 -15 -0.00119 -0.00151 -0.00251 -0.00234 -7.95E-4
50 14 11 10 10 0.00167 0.00139 0.00148 0.00156 0.00172
90 53 44 46 43 0.00631 0.00555 0.00679 0.00671 0.00617
99 567 391 364 368 0.0675 0.0493 0.0537 0.0574 0.0716
100 16319 16318 16327 16321 1.94 2.06 2.41 2.55 1.80
# flux from 0.0679 sr ( 8.61E-8 sr/4px) is 3.29E-4 lx;
# tilewise luminance 0.00453 cd/m2 with rel. SD 286 % (summing pixels below 16380)
# dark frame dark/1m.pgm scaled by 0.1330 (after subtracting an offset frame dark/off.pgm from both images) subtracted
# Yell average= 40.4 minimum= -127 maximum=16319 over 16380: 383
# Cyan average= 29.7 minimum= -89 maximum=16318 over 16380: 526
# Gree average= 27.2 minimum= -250 maximum=16327 over 16380: 457
# Mage average= 27.6 minimum= -291 maximum=16321 over 16380: 506
End of results of "raw2lum" (version 1.22) with parameters:
-c YCGM -fa -w 7.3 -fc1.03 -o 16380 -o dark/off.pgm -d dark/1m.pgm:0.133 -sm200 -nh -i 33.txt -e 33.eps -n 33.ppm -t168 -c 3412 -s64 pgm/33.pgm
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Just points with luminances over 0.20 and below 1.5 cd/m2.
In grid tiles, flux densities from these points and tiles are given.
# Date/Time : 2005:08:05 01:11:21
# Resolution : 2048 x 1536 in jpeg (2064x1540 in pgm/33.pgm)
# Focal length : 23.4mm
# Exposure time: 8.000 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 -28 -30 -39 -34 -0.00333 -0.00379 -0.00576 -0.00530 -0.00261
10 -10 -12 -17 -15 -0.00119 -0.00151 -0.00251 -0.00234 -7.95E-4
50 14 11 10 10 0.00167 0.00139 0.00148 0.00156 0.00172
90 53 44 46 43 0.00631 0.00555 0.00679 0.00671 0.00617
99 567 391 364 368 0.0675 0.0493 0.0537 0.0574 0.0716
100 16319 16318 16327 16321 1.94 2.06 2.41 2.55 1.80
# flux from 1.92E-4 sr ( 8.61E-8 sr/4px) is 7.67E-5 lx;
# tilewise luminance 0.0324 cd/m2 with rel. SD 362 % (points with luminances over 0.20 and below 1.5 )
# dark frame dark/1m.pgm scaled by 0.1330 (after subtracting an offset frame dark/off.pgm from both images) subtracted
# Yell average=3607.9 minimum= -127 maximum=16319 out of range: 792189
# Cyan average=2964.3 minimum= -89 maximum=16318 out of range: 792332
# Gree average=2714.1 minimum= -250 maximum=16327 out of range: 792263
# Mage average=2840.1 minimum= -291 maximum=16321 out of range: 792312
End of results of "raw2lum" (version 1.22) with parameters:
-c YCGM -ft -w 7.3 -fc1.03 -o 16380 -L0.2 -U1.5 -d dark/1m.pgm:0.133 -o dark/off.pgm -sm200 -nh -i 33.txt -e 33.eps -n 33.ppm -t168 -c 3412 -s64 pgm/33.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)
