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09/12/2005 10:32:57 PM · #1 |
I have an old image I am trying to correct. It sunset image with a nice gradient from the sunset colors at one end of the sky to a deep blue up above.
The trouble is... there is "banding" within the sky. As if the color pallette was too small to handle the number of colors in the sky.
Plus, there are obvious jpeg artifacts. Not caused by re-editing, because I am working on the original. I think it is just because of the number of colors gradients across the sky.
My question is... how do you correct something like that?
I've found that if I use the "obvious solution" (gaussian blur seemed obvious to me) it actually makes the problem WORSE! It only marginally gets rid of the jpeg artifacts, but what's worse is that it serves to "solidify" the banding! The more I blur it, the more solid the banding lines become.
So far I have found that my best solution is to use motion blur and to try it at different angles. It seems to help spread out the banding a little ... softening the jpeg artificats along the way. But it just doesn't seem to do "enough" to solve the problem.
Any further ideas/tips?
Thanks!
David
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09/12/2005 10:50:34 PM · #2 |
| Have you tried any noise reduction software? |
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09/12/2005 11:07:45 PM · #3 |
Originally posted by marmalade1121:
Have you tried any noise reduction software? |
Actually, this might make it worse as well. The banding occurs because the color values change only slightly, and very regularly. The range of tones got too compressed at one point in the editing process. It's difficult to recover from this. One thing you could try is actually adding a little noise; that will tend to hide the transitions. This type of thing is pretty difficult to recover from, a lot of data has been lost.
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09/12/2005 11:13:37 PM · #4 |
Originally posted by marmalade1121:
Have you tried any noise reduction software? |
Yup. As kirbic said, it only made it worse (though not as quickly as gaussian blur did).
I think I found the answer!
Instead of blurring it, I added noise. I used only a 2% fill, but it was enough to hide the banding lines. And I don't think it is all that noticeable, even up close.
Edit: It sounds anti-climactic given that kirbic suggested the solution. But I say it with such emphasis because I really did find the solution on my own thru endless playing with different filters.
Message edited by author 2005-09-12 23:17:36.
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09/13/2005 05:17:08 AM · #5 |
Well I'm glad you found a solution for the issue. It didn't even enter my mind that data loss was the culprit (I read OLD IMAGE but I guess I didn't process it very well).
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