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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 16 Jan 2006 (Monday) 11:11
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What causes a halo effect?

 
DAG123
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Jan 16, 2006 11:11 |  #1

What would cause a 'halo' around the outside of a photo?




  
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liza
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Jan 16, 2006 11:35 |  #2
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Post an example with exif data so we can take a look. My guess would be vignetting.



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DavidW
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Jan 16, 2006 11:39 |  #3

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).

David




  
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DAG123
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Jan 16, 2006 11:56 |  #4

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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DavidW
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Jan 16, 2006 12:45 |  #5

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.

David




  
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picard
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Jan 16, 2006 16:14 |  #6

DAG123 wrote:
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. :D


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DAG123
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Jan 16, 2006 16:17 |  #7

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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What causes a halo effect?
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