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David Kilpatrick | profile | all galleries >> Galleries >> awb_etc

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3400Kplus80B.jpg	autoWB+1.jpg	autowith 80B+2.jpg	autowith80B+1.jpg
minus4chromalossauto.jpg	minus4tungstenpresetACR.jpg	rawauto80Bzerominus4ACR.jpg	truerawzeroed+2.jpg
truerawzeroed.jpg	truerawzeroedauto80B.jpg	truerawzeroedautowith80B+2.jpg	tungstenpreset+1.jpg

comment |

David Kilpatrick		03-Apr-2006 22:32
To understand these files, please read. Where I include +1 or +2 as figures, this means camera exposure override on a JPG conversion in camera, or a raw file. All files are camera jpegs except those with raw in the name. Where I write minusfour etc this means using the raw file in Adobe Camera Raw with -4 exposure correction, to export a JPEG. These minus settings are NOT in-camera jpegs. 'Chroma loss' refers to the area of highlight detail which has no colour information accessible by the raw converter, because one channel is clipped. The raw converter then substitutes luminance only (otherwise you get bright blue or bright pink highlights - see Dimage Master 1.0 for magenta examples, see Pentax *ist D series for bright blue (in camera too!)... etc etc. The critical files here are autoWB+1.jpg which shows just how badly Minolta 7D auto WB handles a tungsen studio set with bright white background, and tungstenpreset+1.jpg, which shows how superbly the Manual White Balance Tungsten preset handles 2950K Elinchrom modelling lamps. You will also see that putting an 80B filter on the camera and using Auto WB gives a great result. 'True Raw Zeroed' means Adobe Camera Raw set to 0 exposure, 0 shadows, 0 brightness, 0 contrast and Daylight light balance (the native balance of the CCD).

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