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Weird gradient in sky.

This is a discussion on Weird gradient in sky. within the Post Processing Central forums, part of the Photography Information category; I have one picture that came out with a very nice blue sky. When I use SilverFX to convert to ...

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Weird gradient in sky. - 01-10-2012, 01:20 PM


I have one picture that came out with a very nice blue sky. When I use SilverFX to convert to B&W, I get a very nasty gradient in the sky. I can not see any type of gradient in the sky in the color image. Anyone had something like this happen before and is there a easy way to fix it?



I'll post the color image when I can find it. That's not jpeg compression in the image, you can see that in the original after I convert it.

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01-10-2012, 01:38 PM


I don't know anything about SilverFX, but make sure the image is 16bit and not 8bit.
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01-10-2012, 01:40 PM


Tried it 16bit, same thing. Shows up if I do a grayscale conversion. I'm guessing it's there in in the original color image, jut not easy to see.

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01-10-2012, 01:47 PM


Was it shot RAW?
I would try to do the B&W while staying in whatever RGB mode you're working with vs going to grayscale.

Last edited by Jake; 01-10-2012 at 01:48 PM.. Reason: B
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01-10-2012, 01:48 PM


Yes, shot in raw. I did a raw -> SilverFX and it was there, and did a raw -> gray scale and it showed up also (did the gray scale just to see if it would show). I guess I can smooth it out in PS if I really need to.

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01-10-2012, 01:56 PM


Banding can be a pain to get rid of. Try going 16 bit RAW > B&W via channel mixer in PS and see if it pops up. Sometimes the banding can be worse in a certain color, so with channel mixer you can maybe pin point wheres it's happening.
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01-10-2012, 01:57 PM


Quote:
Anyone had something like this happen before and is there a easy way to fix it?
Yes, and noise is your fiend. Do an internet search of "banding in gradients" for a variety of fixes to this problem.
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01-10-2012, 02:58 PM


Cool. I'll give that a shot when I get home tonight.

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