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Old 16th of January 2006 (Mon)   #1
DAG123
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Default What causes a halo effect?

What would cause a 'halo' around the outside of a photo?
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Old 16th of January 2006 (Mon)   #2
liza
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Default Re: What causes a halo effect?

Post an example with exif data so we can take a look. My guess would be vignetting.
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Old 16th of January 2006 (Mon)   #3
DavidW
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Default Re: What causes a halo effect?

Vignetting sounds right, but that's not normally described as a halo. A vignetted image has dark corners.

The term halo is normally applied to unwanted "futz" at high contrast edges, which is normally chromatic aberration (or oversharpening).



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Old 16th of January 2006 (Mon)   #4
DAG123
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Default Re: What causes a halo effect?

Yes, my mistake, I should have said vignetting.

Sorry can't post photo from my location. I just had some problems with this on the weekend and was curious what was the cause. I suppose you would need to see the photo. If you have a general idea it would be appreciated, I won't be home until Friday
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Old 16th of January 2006 (Mon)   #5
DavidW
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Default Re: What causes a halo effect?

If we know it's vignetting, tell us more about the lens, any filters, hoods or flash that was in use, and details from the EXIF (focal length and aperture especially) - also if you have any idea of the distance between the camera and the subject.



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Old 16th of January 2006 (Mon)   #6
picard
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Default Re: What causes a halo effect?

Quote:
Originally Posted by DAG123
What would cause a 'halo' around the outside of a photo?
It is due to weeds. You see halo effect after smoking a pack of weeds.
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Old 16th of January 2006 (Mon)   #7
DAG123
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Default Re: What causes a halo effect?

It is a Digital Canon EOS Rebel 350XT with stock lens. I have only been using it on auto. I just go it for Christmas and am trying to learn.

Is it normal for the LCD to be blank when shooting RAW?
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