Image 09
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| original | lighter | colour coded
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and with an inserted data grid:
(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).
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)