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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 17 Mar 2009 (Tuesday) 08:38
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Strange banding in photo

 
keenasmustard
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Mar 17, 2009 08:38 |  #1

Hi, A friend asked me what might cause this banding in his photo, which he took on his 450D. I immediately thought it was pixelation from taking the image on a small setting or something similar, but he assured me that it was taken on his highest setting. Could someone please take a quick look at it for me and tell me what you think? I've listed the metadata in the second link.

Also, he mentioned he used a circular polariser, but although this would explain circular rings in an image, I wouldn't think that it would give that "chunky" appearance. Surely this is a data issue?

http://2.bp.blogspot.c​om …pig36k/s1600-h/Sun+02.JPG (external link)

http://3.bp.blogspot.c​om …XI34/s1600-h/metadata.jpg (external link)


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timmyeatchips
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Mar 17, 2009 09:30 |  #2

It may have been taken at the highest settings but it has been saved heavily compressed. This is probably what has caused the posterisation.


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Mike
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Mar 17, 2009 09:33 |  #3

It is some kind of posterization.

http://www.cambridgein​colour.com/tutorials/p​osterization.htm (external link)
http://en.wikipedia.or​g/wiki/Posterization (external link)
http://www.adobeforums​.com/webx/.59b638df (external link)

*edit* beaten to it! ;)


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LeuceDeuce
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Mar 17, 2009 11:22 as a reply to  @ Mike's post |  #4

Was the image saved as a .gif? This will reduce the number of colours to 256 and cause this.


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hawkeye60
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Mar 17, 2009 11:31 |  #5

LeuceDeuce wrote in post #7541556 (external link)
Was the image saved as a .gif? This will reduce the number of colours to 256 and cause this.

Yes, you'd be better to save as a jpeg.


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number ­ six
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Mar 17, 2009 13:28 |  #6

That's not banding, it's jpeg artifacting. Posterization.

And no surprise - it's a 1600 X 1067 picture that's been compressed to only 174K!

You just can't do that and get reasonable quality.

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keenasmustard
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Mar 17, 2009 18:33 as a reply to  @ number six's post |  #7

Thanks guys. POTN strikes again, and you're your usual extremely helpful (and fast) selves whenever I have a question!

When I saw the size of his photo, I immediately presumed he had saved the file again on his computer after resizing or something, but I think you are right: he must have his compression settings set too high on his camera, thus the teeny tiny file. I've relayed your info back to him (it's my husband's colleague) and I'm finding out if that is indeed what he did. I'll let you know the outcome. If it isn't the setting, then we might be dealing with a different kettle of fish.


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number ­ six
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Mar 17, 2009 23:33 |  #8

keenasmustard wrote in post #7543959 (external link)
Thanks guys. POTN strikes again, and you're your usual extremely helpful (and fast) selves whenever I have a question!

When I saw the size of his photo, I immediately presumed he had saved the file again on his computer after resizing or something, but I think you are right: he must have his compression settings set too high on his camera, thus the teeny tiny file. I've relayed your info back to him (it's my husband's colleague) and I'm finding out if that is indeed what he did. I'll let you know the outcome. If it isn't the setting, then we might be dealing with a different kettle of fish.

Don't think so. There's no setting that will give that much compression in-camera, so I figure it was done in PP.

-js


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Strange banding in photo
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