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Blurring the background without the halo?

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  #1  
Old 08-10-2010, 01:07 PM
ekuna ekuna is offline
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Blurring the background without the halo?

Does anybody know how to blur the
background without creating the halo?

Thanks
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  #2  
Old 08-10-2010, 02:14 PM
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JayKittle JayKittle is offline
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Re: Blurring the background without the halo?

An example image may help us to know exactly what you are dealing with
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Old 08-10-2010, 03:05 PM
KTG KTG is offline
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Re: Blurring the background without the halo?

I use Lens Blur to avoid the blur halo. You need to make a good selection or make a good channel mask. In Lens Blur, you use that channel mask as the mask for the object or person. In Lens Blur there is a dialog box to select the Alpha channel plus other options.
k
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Old 08-10-2010, 04:28 PM
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shift studio shift studio is offline
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Re: Blurring the background without the halo?

Quote:
Originally Posted by KTG View Post
I use Lens Blur to avoid the blur halo. You need to make a good selection or make a good channel mask. In Lens Blur, you use that channel mask as the mask for the object or person. In Lens Blur there is a dialog box to select the Alpha channel plus other options.
k
lol at myself! For years, I've been duplicating the masked/clipped subject to a new layer, gaussian blur the layer beneath, the clone out the halo or liquify the halo back underneath the subject.
Thanks for the tip KTG!

--shift studio
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Old 08-10-2010, 04:30 PM
ekuna ekuna is offline
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Re: Blurring the background without the halo?

I don't know if this image shows it better,
but that's what I'm talking about.
Attached Images
File Type: jpg halo.JPG (48.3 KB, 84 views)
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Old 08-10-2010, 04:52 PM
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Der_W Der_W is offline
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Re: Blurring the background without the halo?

You're not talking about halos, but about banding :-).
To avoid them, work in 16Bit, use more different shades for your gradients or if everything else fails, add some noise.
In between, you should try to print it, sometimes banding occures due to limitations of the monitor and not in print.
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Old 08-10-2010, 07:05 PM
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mistermonday mistermonday is offline
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Re: Blurring the background without the halo?

I agree with Jonas. What you appear to have is banding and his suggestions are the usual ways to avoid it.
Regards, Murray
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Old 08-10-2010, 11:39 PM
Quantum3 Quantum3 is offline
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Re: Blurring the background without the halo?

Quote:
Originally Posted by shift studio View Post
lol at myself! For years, I've been duplicating the masked/clipped subject to a new layer, gaussian blur the layer beneath, the clone out the halo or liquify the halo back underneath the subject.
Thanks for the tip KTG!

--shift studio
Bro!!! How's going!

Lens blur is the best thing for that, but it only uses 1 core so it's slow as working with one core...

You can mask out the subject and load that mask (or any alfa) on the lens blur pull down menu in order to blur the image. I figured that the layer with the mask should be a duplicate for best results.

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Old 08-11-2010, 06:27 AM
luciekout luciekout is offline
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Re: Blurring the background without the halo?

it`s called posterization, you can get rid of it by adding grain... it`s caused by gaussian blur algoritmus, same problem is with gradients...

lens blur uses grain and different way of blurring
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Old 08-11-2010, 10:41 AM
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shift studio shift studio is offline
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Re: Blurring the background without the halo?

Quote:
Originally Posted by Quantum3 View Post
Bro!!! How's going!

Lens blur is the best thing for that, but it only uses 1 core so it's slow as working with one core...

You can mask out the subject and load that mask (or any alfa) on the lens blur pull down menu in order to blur the image. I figured that the layer with the mask should be a duplicate for best results.

Hi Mart - its going good! and you?
I gave that a try yesterday and I am impressed by the results and embarrassed that I didn't know it .

Now, thats not what the OP was asking about even.... ha ha.

A great (and little known) solution for banding thats not too harsh, or near a distinct edge is the brush strokes/spatter filter set with r=3-25 and smoothness = 1. See attachment.

Hope it helps.
--shift studio.
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File Type: jpg BandingFix.jpg (59.7 KB, 52 views)
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