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Is this chromatic aberration? (1 image)
Take a look at the tree tops, at the upper center part of the photo. If this is CA, it's the weirdest I've ever seen....

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There was a CPL on the lens, I wonder if that's got anything to do with it....

Any opinions?.

Http://www.flickr.com/photos/96953368@N00/..

Comments (16)

Perhaps it is just direct sunlight hitting the tops of the trees. It is not CA.Nothing is enough for the man to whom nothing is enough...

Comment #1

It look more like an exposure for the shaded forest meets the fully sun lit tree tops to me, like clipping above the shade canopy. I think it's a pretty cool effect.End of RantTim..

Comment #2

But more than likely there is some in that photo. Virtually everytime someone complains about CA, it's a shot looking up at tree branches against a bright sky. Perfect conditions to induce CA in even the best of lenses..

Ancient_Mariner wrote:.

Take a look at the tree tops, at the upper center part of the photo.If this is CA, it's the weirdest I've ever seen....

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

There was a CPL on the lens, I wonder if that's got anything to dowith it....

Any opinions?.

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Comment #3

Here's a 100% crop. It looks very weird indeed....

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It's definitely nothing natural (i.e. nothing physical caught among the branches). It's lens- or camera-related....

Http://www.flickr.com/photos/96953368@N00/..

Comment #4

Ancient_Mariner wrote:.

Here's a 100% crop. It looks very weird indeed....

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It's definitely nothing natural (i.e. nothing physical caught amongthe branches)..

I think it's entirely natural in that it appears to be simply the upper branches being lit by direct sunlight..

It's lens- or camera-related....

Well, it's possible that those upper branches are too bright for the sensor to handle, rather like this image (different camera):.

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That sample comes from a recent review http://www.dpreview.com/reviews/canonsd1100is/page3.aspThe comment is made:.

"The symptoms are well known to anybody who has used a digital compact camera before. On an overcast day you'll end up with blown out white skies most of the time and in high contrast scenes parts of your image will be hopelessly over exposed".Regards,Peter..

Comment #5

If you look the tree to the left has the upper branches getting direct sun while most of the rest of the scene appears to be in shade. It looks like the top of the tree in the center of the scene has branches in the same direct light...

Comment #6

Ancient_Mariner wrote:.

Here's a 100% crop. It looks very weird indeed....

Http://static.zooomr.com/images/4371339_0ebdc4a9c4.jpg.

It's definitely nothing natural (i.e. nothing physical caught amongthe branches). It's lens- or camera-related....

It is weird, but I think I have an idea what it might be. But first, could you post a maximum quality 100% crop? The JPEG artefacts in the one you posted are making it difficult to see the detail...

Comment #7

Sections of the trunk are bright white. There is probably some CA but I think it's mostly sunlight. You may not recall, but when the picture was taken what did the scene look like when looking up?.

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Comment #8

Tim'Be the change you wish to see in the world.' -Mahatma GandhiE3/E1/7-14/12-60/50-200/EC-14/C8080http://www.flickr.com/photos/timskis6/..

Comment #9

I second that, clipping on the light bark in direct sun.End of RantTim..

Comment #10

But I'm guessing not in the particular location you're referring to. PF is visible on the edges of some of the branches that are more properly exposed. The bright branches are improperly exposed..

Tim'Be the change you wish to see in the world.' -Mahatma GandhiE3/E1/7-14/12-60/50-200/EC-14/C8080http://www.flickr.com/photos/timskis6/..

Comment #11

Steve Balcombe wrote:.

It is weird, but I think I have an idea what it might be. But first,could you post a maximum quality 100% crop? The JPEG artefacts in theone you posted are making it difficult to see the detail..

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Here you go...

(Hmm..This is maximum quality, yet it looks quite jagged..Weird).

I do recall the scene, it's a recent photo. There was, indeed, some direct sunlight, but a) it looked nothing like that. b) I've got plenty similar photos with direct sunlight, and they're entirely different...

Meters and cameras work in mysterious ways .

Http://www.flickr.com/photos/96953368@N00/..

Comment #12

Hey, wait a moment...I'm an idiot .

No wonder it has artifacts, it's the JPEG basic file from the camera, here's from the RAW file, saved at maximum quality.

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Http://www.flickr.com/photos/96953368@N00/..

Comment #13

Ok, well, overexposure is certainly a factor in this but it's not the whole story. After all, a blown sky is white, not pink. Usually when overexposure causes colour shifts it is because one channel is overexposed (clipped) and the others are not - but that turns out not to be the case here. There are blown highlights on the branches, as others have pointed out, but not in the pink sky..

I have a very vague recollection of reading, years ago, about a problem that used to plague early digital cameras. It was to do with coloured artefacts that would appear in bright areas, but it wasn't simple channel clipping, it was something related to processing the RAW image - demosaicing probably, but I'm not sure. I remember it being illustrated with a picture of a large ship ploughing through the water, and the white broken waves were magenta/pink - just like this. Maybe that will ring a bell with someone else and they can fill in the blanks for me..

That all sounds very vague, and it is, I just can't remember the detail and I can't think what the source would have been to look it up again. But it does suggest a possible solution - try a different RAW converter. It certainly has to be worth a try. There a free trial of CaptureOne, so that would be one to try perhaps..

But I also wouldn't rule out some sort of fringing/blooming as others have suggested. I tend to think that is less likely because there are some quite large areas of magenta, but I'm by no means certain...

Comment #14

This is quite an interesting theory....

The previous image was from ACR, I also tried with Nikon Capture NX, and it produces exactly the same result....

Anyway, thanks everyone for your ideas .

Http://www.flickr.com/photos/96953368@N00/..

Comment #15

Ancient_Mariner wrote:.

This is quite an interesting theory....

The previous image was from ACR, I also tried with Nikon Capture NX,and it produces exactly the same result....

Hmm, well as far as I know they don't share the same demosaicing algorithms, so I guess that rules out the demosaicing theory...

Comment #16

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