On Fri, Aug 10, 2007 at 11:41:01AM -0600, William Robb wrote: > > ----- Original Message ----- > From: "Godfrey DiGiorgi" > Subject: Re: Recommendations for digital grey card > > > > > White balance should be of no consequence, although it's possible > > that changing the white balance somehow affects the metering > > calibration ... dunno. Although it is true that imaging and metering > > sensors are more sensitive to light in the red/IR range than in the > > green/blue range, and incandescent light is shifted way into the red > > range, so maybe the adjustment to WB could affect it in that way > > somehow... > > I've always been a little vague about precisely what white balance is doing, > I've alway presumed that it is adjusting the gain of the colour receptors. > If so, is it possible that the exposure variance could be generated by the > voltage multiplier, not the exposure system itself? > > William Robb
What white balance does depends on the design of the circuitry. On most digital cameras white balance has absolutely no effect on raw capture. On some sensors, though (including the one Nikon use in the D2 models, if memory serves) white balance does exactly what you surmise, affecting the gain applied to the sensors during the initial readout. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
