While there is a chromatic aberration that will cause purple fringing,
that will show on film as well. My understanding is that the purple
fringing Shel is probably talking about is a digital artifact caused by
high contrast edges. There is a control in the Raw Converter in
Photoshop CS2 that is supposed to minimize purple fringing. I have not
used it because Ihave not seen the problem to the point where it is
visible in the 8x10 to 8.5x11 prints I do, so this is all theoretical to
me.
graywolf
http://www.graywolfphoto.com
"Idiot Proof" <==> "Expert Proof"
-----------------------------------
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
