Hmm, now I thought that the purple fringing problem was due to the sensor where saturated cells flood their neighbors. Here's what dpreview says on the subject...
<http://www.dpreview.com/learn/?/Glossary/Digital_Imaging/Blooming_01.htm> t On 9/21/05 8:00, [EMAIL PROTECTED] wrote: > Interesting, although based on considerable experience, it seems that a purple > fringing boundary effect occurs much more frequently with certain lenses. > However that could be related to what type of shooting I do with those lenses. > For example, I use my A 400 and A2X-S converter to shoot birds that are higher > up in trees. This situation frequently gives me an underexposed backlit branch > against a bright sky -- and purple fringe. I've been blaming it on the > converter/lens combination. > Paul > > >> Most of the purple fringing I see is a sensor effect, not lens >> related, on high contrast boundaries where one side of the boundary >> is at saturation and the other is underexposed. >> >> Godfrey >> >> On Sep 21, 2005, at 4:33 AM, Paul Stenquist wrote: >> >>> Hi Shel, >>> Sometimes it's a result of red and blue chromatic aberration. If >>> so, you can correct it reasonably well by going to the "lens" tab >>> in the RAW converter and adjusting the CA sliders. At other times >>> it seems to be the result of backlight on dark objects, such as >>> branches against a sky and doesn't seem to be affected much by CA >>> adustment. I find this effect is more common to some lenses than >>> others. In situations where it was important to remove the fringe >>> and CA adjustment yields little improvement, I've occasionally >>> resorted to cloning it out after masking or selecting the >>> appropriate area. Lots of work, but it can be done effectively. >>> Paul >>> On Sep 21, 2005, at 6:48 AM, Shel Belinkoff wrote: >>> >>> >>>> Any suggestions on how to rid an image of purple fringing ... >>>> >>>> >>>> Shel >>>> >>>> >>>> >>> >>> >> > > >
