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Problem with bright fringe/halo

Gary Anthes , May 17, 2011; 12:06 p.m.

Occasionally when shooting sharply defined dark subjects against a bright background (e.g., dark tree branches against a bright sky) I get thin (maybe 2-4 pixels) bright fringes around the dark object. An example is attached, greatly zoomed and tweaked in Photoshop to exaggerate the effect. It was taken with a Canon 50D with a Canon 24-105 F/4L zoom, my most common combo. It was shot at F/11 and 24mm.
Questions: How can this be avoided? How can it be corrected in post-processing?

Pesky fringes


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Rob Bernhard , May 17, 2011; 12:15 p.m.

Can you provide a crop of the same area as it does come out of the camera, rather than the exaggerated version?

Matt Laur , May 17, 2011; 12:21 p.m.

Are you shooting straight to JPGs? If so, how hard are you telling your camera to sharpen, as it creates those files?

Gary Anthes , May 17, 2011; 12:21 p.m.

Rob, it's attached. I can assure you the fringe is there, although it's almost impossible to see because now it's the same color as the sky. So of course this wouldn't be an issue if I hadn't wanted to darken the sky. Thanks for your thoughts.

Less Pesky Fringes

Bob Atkins , May 17, 2011; 12:26 p.m.

Looks like a processing effect, probably too much sharpening. Try shooting RAW and adjusting the sharpness parameter in DPP.

Rob Bernhard , May 17, 2011; 12:43 p.m.

[[I can assure you the fringe is there,]]

I have no doubt that 100% views of digital images can show you all manner of interesting things. Adobe Lightroom has a nice tool for reducing chromatic aberrations that may help. Canon's Digital Photo Professional should also help here. The latest versions from both should have a profile for this lens.

Stepping back, I believe question should be be: how is it affecting the final product? If you're making 22x34 prints this is may be more of a concern. But just staring at 100% views without considering output is not a useful exercise.

Geoff Sobering , May 17, 2011; 12:46 p.m.

I agree with Bob, the white fringe is almost certainly coming from a too aggressive unsharp-mask filter.
Is this a "from camera" JPEG?

Gary Anthes , May 17, 2011; 12:58 p.m.

The image was shot direct to highest quality JPEG with the in-camera sharpening set at two notches above mid-point/default. It comes out of the camera with the fringe, so I'm going to knock off the in-camera sharpening.
But it's not just noticeable at 100% zoom. It can be seen on reasonably close inspection on a few of my post-processed 12x18 inch prints.

Rob Bernhard , May 17, 2011; 12:59 p.m.

From the original post:
"An example is attached, greatly zoomed and tweaked in Photoshop to exaggerate the effect."

Which is why I asked for the original version that Gary was able to provide.

Gary Anthes , May 17, 2011; 01:14 p.m.

Rob, perhaps I wasn't clear. The "tweak" was to darken the sky and make the fringing more visible. It did not add the fringing.

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