Striations in Background with Gaussian Filter

PD
Posted By
Paul_D._Ropson
Sep 7, 2006
Views
1116
Replies
13
Status
Closed
I am using CS2 windows. I photographed a subject against a white background. When I apply the gaussian filter to a layer,color striations appear through out the background. Similar to color reflections off an oil slick. The patterns are slight but very noticable. In a seperate photo, I converted to B&W and applied the gaussian filter. Again striations throughout the background. They appear as varying densities of gray. What can I do?

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CN
Cybernetic Nomad
Sep 7, 2006
Are you viewing the image at 100%.

Are you sure you do not mean banding?
JJ
John Joslin
Sep 7, 2006
What was the white background?
PD
Paul_D._Ropson
Sep 7, 2006
I am not familiar with banding. What causes it?
PD
Paul_D._Ropson
Sep 7, 2006
The background was a white muslin. It was far enough back that it showed up as gray.
PD
Paul_D._Ropson
Sep 7, 2006
I am viewing the image at 100%. When printed, the "banding" shows quite clearly. I could email you the image and you could see it.
PF
Peter_Figen
Sep 7, 2006
Well, of course. Gaussian Blur will cause banding if it’s a large enough blur. You need to add noise into the background to eliminate the banding.
C
chrisjbirchall
Sep 7, 2006
PD
Paul_D._Ropson
Sep 7, 2006
I posted it on pixentral.com. It is of a ballet dancer. Notice the bands in the darker sections. I am not sure what causes banding. Is there a way to prevent it rather than disquise it with noise?
PF
Peter_Figen
Sep 7, 2006
Paul,

You need to post the link to the pixentral pic. Typically, if you have banding induced by blur, the only way to get rid of it is with noise.
C
chrisjbirchall
Sep 7, 2006
Paul. Underneath your picture on Pixentral is some code to copy and paste into the forum here,
PD
Paul_D._Ropson
Sep 7, 2006
Is this it?http://www.pixentral.com/hosted/1MxfOyyBVagRV7dzM05rskR0Rt1d_thumb.jpg
CN
Cybernetic Nomad
Sep 7, 2006
try this:

< http://www.pixentral.com/show.php?picture=1MxfOyyBVagRV7dzM0 5rskR0Rt1d>

And yes, definitively you have banding, try adding noise to the background
PD
Paul_D._Ropson
Sep 7, 2006
I added 1.5% noise to the layer that contained the background gaussian filter and the bands disappeared or were adequietly disguised. I would prefer a clean, smooth background but it would seem I have hit the limit of technology.

Thank you all for your input.

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