Why the purple fringe? The two images are SOOC; the 2nd one was enlarged by 2x in camera. In every frame of over 90 pictures there is a purple frame abound the bird. Pictures taken...

Floyd Loc: Misplaced Texan in Florence, Alabama

The two images are SOOC; the 2nd one was enlarged by 2x in camera. In every frame of over 90 pictures there is a purple frame abound the bird. Pictures taken yesterday using the same camera settings do not have the purple fringe.
Your help will be appreciated.

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CHG_CANON Loc: the Windy City

It's called "Chromatic aberration" that manifests itself as "fringes" of color along boundaries that separate dark and bright parts of the image, typically purple. Note the first image was captured at f/8, while the second with the purple fringing was captured at f/5.6. As noted in this wiki discussion, chromatic aberration can be addressed by stepping down the lens - https://en.wikipedia.org/wiki/Chromatic_aberration

You can also use the lens correction profiles for chromatic aberration, either using the lens profiles applied by the camera to JPEGs, or by digital editing software, either via automated profiles or by selective edits by the human.

fergmark Loc: norwalk connecticut

With the same lens? Of objects outlined against the sky ?

Ysarex Loc: St. Louis

Floyd wrote:

The two images are SOOC; the 2nd one was enlarged by 2x in camera. In every frame of over 90 pictures there is a purple frame abound the bird. Pictures taken yesterday using the same camera settings do not have the purple fringe.
Your help will be appreciated.

That is chromatic aberration -- purple fringing, and the lens is responsible. We see it most often along very high contrast (dark/light) edges. Tree branches against a sky would be one of the most common cases which you have here. It is very difficult to design a lens that is free of CA so we all tend to live with some degree of it. It can be successfully removed during software processing and your camera's JPEG processing software should be taking care of it.

If the camera isn't getting the job done you can save a raw file and remove it in processing.

Joe

Longshadow Loc: Audubon, PA, United States

Same lens also?

camerapapi Loc: Miami, Fl.

Backlighting conditions bring about the fringing. I have been very successful controlling fringing in post (chromatic aberration) but I have not been with your image.
Fringing is more common with teles and low dispersion glass is supposed to control this lens aberration but with digital it does not always work like that and I cannot explain why.

rehess Loc: South Bend, Indiana, USA

Floyd wrote:

The two images are SOOC; the 2nd one was enlarged by 2x in camera. In every frame of over 90 pictures there is a purple frame abound the bird. Pictures taken yesterday using the same camera settings do not have the purple fringe.
Your help will be appreciated.

Was "yesterday" sunny - were the second set of photographs also backlit, taken under cloudy conditions??

Floyd Loc: Misplaced Texan in Florence, Alabama

CHG_CANON wrote:

It's called "Chromatic aberration" that ... (show quote)

Thank you for your information. I learned something, which is always good, and am in the process of learning GIMP to be able to correct these type problems. Thanks again.

Floyd Loc: Misplaced Texan in Florence, Alabama

fergmark wrote:

With the same lens? Of objects outlined against the sky ?

Yes to both questions and from the responses I'm getting it is correctable. Thank you.

Floyd Loc: Misplaced Texan in Florence, Alabama

Ysarex wrote:

That is chromatic aberration -- purple fringing, a... (show quote)

Thank you for the information. I hope to learn to do this type correction in GIMP.

Floyd Loc: Misplaced Texan in Florence, Alabama

Longshadow wrote:

Same lens also?

Yes. Thank you for replying.

Floyd Loc: Misplaced Texan in Florence, Alabama

camerapapi wrote:

Backlighting conditions bring about the fringing. I have been very successful controlling fringing in post (chromatic aberration) but I have not been with your image.
Fringing is more common with teles and low dispersion glass is supposed to control this lens aberration but with digital it does not always work like that and I cannot explain why.

Thank you for your response. I've learned a bunch from all responders and I hope to learn to correct this problem using information from today.

Floyd Loc: Misplaced Texan in Florence, Alabama

rehess wrote:

Was "yesterday" sunny - were the second set of photographs also backlit, taken under cloudy conditions??

These images taken on the same day; previous day about the same time of day and was clear and very bright. Thank you for your time.

JimH123 Loc: Morgan Hill, CA

Floyd wrote:

Yes to both questions and from the responses I'm getting it is correctable. Thank you.

CA being correctable is not quite correct. CA is destructive to the image. When the case is mild, CA can be hid to the point it is not very visible. With extreme CA, hiding it is not possible. You may get rid of the purple, or green, but the broader area that has been treated will never look that good.

Best thing to do is strive to prevent CA from happening. Stopping down is one way. But some lenses are also more prone to having CA than other lenses. And of course, darks against very bright edges are the worst possible condition.

alberio Loc: Casa Grande AZ

Floyd wrote:

The two images are SOOC; the 2nd one was enlarged by 2x in camera. In every frame of over 90 pictures there is a purple frame abound the bird. Pictures taken yesterday using the same camera settings do not have the purple fringe.
Your help will be appreciated.

If your lens used fluorite in the production of the glass it would be almost gone.
The astronomers use the term Apochromatic for the higher quality lens and Achromatic for the less.