That's awesome. Do you have any of them scanned? I'd love to show them to a MUA friend.
On Tue, Jun 14, 2011 at 4:40 PM, William Robb <anotherdrunken...@gmail.com> wrote: > On 14/06/2011 12:46 PM, Igor Roshchin wrote: >> >> >> Tue Jun 14 13:48:28 EDT 2011 >> John Francis wrote: >> >>> On Tue, Jun 14, 2011 at 11:03:41AM -0400, Igor Roshchin wrote: >>>> >>>> Hi All! >>>> >>>> After taking photos at a party, I discovered an interesting effect. >>>> It was indoors, with uneven and not very bright light, so, I used >>>> a flash bounced from the ceiling, which made the light rather uniform. >>>> [ . . . ] >>>> I suspect, that this particular color (dye) fluoresces from the flush, >>>> or something like that. >>> >>> Quite likely - dyes (or pigments) used to colour plastic items often >>> have significant response to ultra-violet light. Even if they don't >>> fluoresce, the output from a flash can produce quite a bit of UV light, >>> and sensors "see" further into the UV than does the human eye. >>> >>> You could try using a UV filter on either the camera or the flash. >> >> John, >> >> Even though purple might have an mixture of blue/violet with red, >> I would expect that purple would be farther on the spectrum and closer to >> the violet part than blue. >> >> That would mean that hitting the violet (or UV) part of the spectrum >> should shift the color toward violet, not toward blue. >> >> > Igor, filters aren't all that spectrum specific, and tend to be cut filters, > in that they don't pass any spectrum below a particular wavelength (which > will vary from filter to filter). > UV florescence has been a problem since the dawn of electronic flash. A lot > of things reflect a disproportionate amount of UV light. > This is especially true of man made fabric materials (nylon, rayon, satin, > and the like and make up. > My wife has a lovely emerald green gown that photographs blue with flash, > and bluey green under daylight, for example. > A wedding I shot many years ago ended up being an epic fail because the > bride and bridesmaids ended up pooling their make up resources, and probably > used half a dozen different brands of product. > They looked gorgeous, but the flash pictures showed all sorts of blotches > and zebra stripes where make up brands met each other. > > -- > > William Robb > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- David Parsons Photography http://www.davidparsonsphoto.com Aloha Photographer Photoblog http://alohaphotog.blogspot.com/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
