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some halo in to the background

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Old 05-29-2009, 12:58 AM
jarulex's Avatar
jarulex jarulex is offline
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Location: Monaco-France
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some halo in to the background

Hello Folks! It's a real pleasure discussing with you....
My problem is that I worked with a 'substitute camera' which provides a low pixelsfile, than I did an heavy PS intervention on the background to enlarge it through a selection. The results are heavy 'halos' on the concentric circles... Do you think there's a way out somehow? Thanks in advance.
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Old 05-29-2009, 01:08 AM
Flashtones Flashtones is offline
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Re: some halo in to the background

That's called banding. If possible, add noise to the background before you do your interventions. Otherwise, add it to the background now and then do a slight blur on it.
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Old 05-29-2009, 08:19 AM
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mistermonday mistermonday is offline
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Re: some halo in to the background

Flashtones is correct. What you have is banding which is a result of all the gaps that were created in the Histogram when the levels were adjusted. If you want to see the extreme side of this effect just go Image>Adjust>Equalize and examine the Histogram. One thing which will help prevent banding is to open your original image in 16 Bit Depth and work in 16 bit until you are finished editing and then convert to 8 bit for output.
Regards, Murray
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