Good points, Jos. And a clear explanation of what's going on with fluorescent lights. Paul On Mar 21, 2008, at 3:43 PM, Jos from Holland wrote: > Interesting thread! > A few things I like to contribute: > > * No machine can fully compete with the AWB in our brains. A > person > sitting under a green sunshade might get a greenish skin colour, > our brain knows about this effect and corrects for it. The > greenish skin colour might remain un noticed by us. But > looking to > the picture later we see a greenish face! The question is : what > do we want in our photographes? Reallity (in the above example > greenish skin colour) or natural looking colours? I always go > for > the last one meaning I have to correct in post processing. > * I remember the principle way of working of the lamps discussed: > discharges in noble gas emit UV, the UV hits special phosphor on > the glass, the phosphor emits visible light, to get white > light a > mix of different phosphor is used, those different phosphors > emit > different colours. In an old fashioned (non-electronic ballast) > the phosphor is excited at the mains frequency (50 or 60 > times per > second) It is almost certain that the different phosphors for > the > different colours do not decade their intensenty in the same > timing. So over a period of 1/50 second the colour might be > white, > but if I take a picture with a faster shutter time, the colour > will depend on the excact portion of the 1/50 second that I hit. > > Greetz, Jos > > > Christine Aguila wrote: >> LOL! But seriously, this did help clarify matters a bit for me. So, >> thanks. Cheers, Christine >> >> >> ----- Original Message ----- >> From: "Doug Franklin" <[EMAIL PROTECTED]> >> >>> You're asking a two year old to interpret Kafka when you set the >>> camera >>> to AWB. >>> >>> >>> -- >>> Thanks, >>> DougF (KG4LMZ) >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly >>> above and >>> follow the directions. >>> >>> >> >> >> >> > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above > and follow the directions.
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