color seperation

S
Posted By
Stagshrine
Mar 4, 2006
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485
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Does anyone have any technique for removing color seperation? I have some shots whit noticable color seperation in some high contrast areas.

—
"These are the times that try men’s souls." Tom Paine

Stagshrine

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MH
Mike Hyndman
Mar 4, 2006
Post an example? see http://www.pixentral.com

"Stagshrine" wrote in message
Does anyone have any technique for removing color seperation? I have some shots whit noticable color seperation in some high contrast areas.
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"These are the times that try men’s souls." Tom Paine
Stagshrine

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S
Stagshrine
Mar 4, 2006
I posted example.

< http://www.pixentral.com/show.php?picture=1fjd0zUXourPknyxrJ WxWxPF7mKgaH> Note color seperation over top edge of egrets.

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"These are the times that try men’s souls." Tom Paine

Stagshrine

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MH
Mike Hyndman
Mar 5, 2006
"Stagshrine" wrote in message
I posted example.

S,

How was the image obtained and have you applied any sharpening to the it

MH

< http://www.pixentral.com/show.php?picture=1fjd0zUXourPknyxrJ WxWxPF7mKgaH> Note color seperation over top edge of egrets.

—
"These are the times that try men’s souls." Tom Paine
Stagshrine

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S
Stagshrine
Mar 5, 2006
No sharpening. It was taken with a Nikon 995 using a 3X teleconverter. Color separation is a common problem with Digital photography and is caused by the optics. I do not know why it is worse with digital than film. Most Digital lenses are designed to minimize color separation. It usually appears in high contrast situations. It is most common in the red area of the spectrum. Newer cameras and lenses are significantly better at preventing color separation than the earlier digital camera’s and lenses. In this case I can remove it by zooming in and using the clone tool to painting over it. In other cases it is more difficult. I have a shot with oak trees against a bright sky. There is a red color shift halo around the oak trees. The trees are way to complex to permit that kind of approach.

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"These are the times that try men’s souls." Tom Paine

Stagshrine

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MH
Mike Hyndman
Mar 6, 2006
"Stagshrine" wrote in message
No sharpening. It was taken with a Nikon 995 using a 3X teleconverter. Color separation is a common problem with Digital photography and is caused
by the optics. I do not know why it is worse with digital than film. Most
Digital lenses are designed to minimize color separation. It usually appears in high contrast situations. It is most common in the red area of the spectrum. Newer cameras and lenses are significantly better at preventing color separation than the earlier digital camera’s and lenses. In this case I can remove it by zooming in and using the clone tool to painting over it. In other cases it is more difficult. I have a shot with
oak trees against a bright sky. There is a red color shift halo around the
oak trees. The trees are way to complex to permit that kind of approach.
S,

Are you seeing this chromatic aberation in all your shots or just when using the converter?
I take a lot of pictures in schools of white shirts against a black background using a Nikon D70 and have not seen the problem your are experiencing. Prior to the D70 I was using 801’s (film) and the results are indistinguitable from each other. It could be a problem with your CCD, magnified by mismatched optics.
Is the converter a Nikon? I have seen some cheaper ones that introduce colours into an image. Also, a 3x is going to result in quite a bit of light loss, as you know and if using tele’s with an f4/5.6 apature to start with you are needing to shoot with high ISO ratings, which can also cause problems re noise etc.,

MH
S
Stagshrine
Mar 7, 2006
I use only Nikon Glass. I can get it without the converters but the converters will exaserbate it.
Color seperation is a well known problem.

The D70 is about 3 years later than the 995 and has a much better sensor and frimware.

What I am trying to find out is if there are any photoshop tricks for erasing it.
—
"These are the times that try men’s souls." Tom Paine

Stagshrine

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MH
Mike Hyndman
Mar 7, 2006
"Stagshrine" wrote in message
I use only Nikon Glass. I can get it without the converters but the converters will exaserbate it.
Color seperation is a well known problem.

The D70 is about 3 years later than the 995 and has a much better sensor and
frimware.

What I am trying to find out is if there are any photoshop tricks for erasing it.
—
"These are the times that try men’s souls." Tom Paine

Stagshrine

A couple of suggestions from another forum re your problem

"Assuming you are shooting RAW, have you looked at the Chromatic Aberration controls under the "Lens" tab in ACR?

If not RAW, then I would gently wipe the edges with the desaturation tool, set at 10% flow.
This also works if it appears not to be CA, but channel clipping. For post-RAW CA correction there’s also PT-lens:

http://www.epaperpress.com/ptlens/

HTH
Mike H

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