Fringing and Halos on Selections

MC
Posted By
Martin Coleman
Sep 22, 2003
Views
391
Replies
4
Status
Closed
This image is an example of something I am spending hours trying to correct. In case the link doesn’t work It’s a digital photo through a window with leaves accross the window. The camera exposed for the view but underexposed the window frame and leaves. I used a Curves adjustment layer and a layer mask to lighten the window, but it’s left me with a halo around the leaves. I reduced it a bit by trying various levels of gausian blur on the mask and levels of feathering with my selection but I am still not getting it right.

< http://www.icdphotos.com/album/album_fullsize.html?c_photo=4 885069>

the file size is about 300K

I am having a similar problem with a kind of ugly grey fringing when I try to seperate skys from landscapes (especially with foliage). No matter how hard I try I get an ugly grey border to the selection. It seems to me that the land colour takes on some of the sky colour (or visa-versa)?

Anyway, a few pointers would be great.

Thanks

Martin

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Y
YrbkMgr
Sep 22, 2003
Your link isn’t working – it requires that one "log in" so without having seen your image it’s hard to suggest a strategy. However, the following thread may be of some value…

barry gray "Merging Images" 8/28/03 5:53am </cgi-bin/webx?13/1>

Peace,
Tony
MC
Martin Coleman
Sep 24, 2003
Thanks for looking anyway.

I’ve moved the image to fotopic which I don’t think needs a log-in.

Here’s a link:

<http://martcol.fotopic.net/photo.php?id=1285985>

As I say, there are halos around the leaves that come from using a layer mask in a Curves adjustment layer. No Gausian Blur gave a very hard, thin halo, too much gave a wide, faded but very noticable halo, this seemed to be the most acceptable compromise.

The two window thread was interesting but I only have one shot.

Thanks

Martin
W
whozit
Sep 24, 2003
You are probably seeing Chromatic Aberration when you are correcting for the underexposure; it’s a well documented problem with Digital camera photography, usually described as "purple fringe"…what color is your ‘halo’?

Sometimes you can desaturate the magenta values a bit to help correct it, but there seems to be no easy PS fix (as of yet). Best I can suggest is somehow lasso the fringe and use the clone stamp…

Beautiful pic, though. I can see why you worked so hard on it.
MC
Martin Coleman
Sep 28, 2003
Ol’ Whozit, that was the nicest thing….

Anyway, I’m now going to link to my (partially) worked pic and the original. I thought Chromatic Aberration was a camera or capture problem and I don’t think it’s in the original unless the curves adjustment brought it out. The other thing is that it as I said originally, the halo appears after selecting to make a layer mask to restrict the curves adjustment to the window frame and leaves.

Worked image: <http://martcol.fotopic.net/photo.php?id=1285985>

Original: <http://martcol.fotopic.net/photo.php?id=1315868>

Hope that all works

Thanks

martin

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