Processed images from London, 2003

The first image in a row is a standard jpeg as stored within the original raw file (*.raf, for Fuji S5000) -- a scene as processed by the own camera software.

Each second image in a row shows luminance coded by colours (each colour corresponds to another power of ten, scale is logarithmic; mean red is 1 cd/m2 or one nit (1 nt), mean green is 10 cd/m2)

Each third image has a grid overlay. Average luminance of each tile is written at its bottom (in cd/m2). (The middle number in each tile is a median value of green pixels.) Each fourth image has the same grid overlaid on colour-coded lumiances.

Indoor ones, from the Childhood Leukaemia conference, lecture by Richard Stevens

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London at twilight

07.jpeg 07.png 07g.jpg 07g.png Westminster bridge over Thames, Parliament and Big Ben are here. Glare from the lamps on the bridge is becoming dominant already. (Vignetting far from the image centre is not corrected, and is very apparent in images with colour-coded luminance.)

08.jpeg 08.png 08g.jpg 08g.png A view down the Thames, with Charing Cross and Hungerford bridge.

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London by night

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27.jpeg 27.png 27g.jpg 27g.png A pleasant court illuminated by gas lamps. A beam from a skybeamer behind. Sky luminance from 0.10 nt to 0.05 nt, terrain about 0.02 nt.

28.jpeg 28.png 28g.jpg 28g.png Sky with Vega and Deneb within the top of the Northern Cross. Towards city centre, sky luminance is about 20 mnt.

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31.jpeg 31.png 31g.jpg 31g.png Sky with Andromeda stars, away from city centre. Sky luminance about 17 mnt (millinits) = 0.017 cd/m2

33.jpeg 33.png 33g.jpg 33g.png Sky with Andromeda stars and some high clouds; airplane at upper right. Clear sky luminance about 16 mnt, clouds have 19 mnt