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Photo Retouching "Improving" photos, post-production, correction, etc.

How to blur one color channel ?

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  #1  
Old 02-15-2006, 06:07 AM
eogg eogg is offline
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How to blur one color channel ?

Hi all,

first of all - I'm glad to have landed here !

I wanted to ask you whether it is possible to Gaussian blur one specific color channel - or to obtain a similar effect ?
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Old 02-15-2006, 06:14 AM
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mistermonday mistermonday is offline
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Yes, it is possible to GB only one channel, assuming that your software allows you to access individual channels. In Photoshop, for example, you click on the Channel Tab in the Palette. Click on the channel that you want to blur. Then from the Filter Menu, select Blur>Gaussian Blur.
Regards, Murray
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Old 02-15-2006, 06:19 AM
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byRo byRo is offline
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Murray beat me to it this time.....

Just to add....

Actually almost all of the filters, and many of the Image>Adjustments will work on the indivudual channels.

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Old 02-15-2006, 05:30 PM
Nick Tuason Nick Tuason is offline
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I can't seem to figure out how to mask in one channel. Say I want to blur only the skin on the green channel but not eyes, mouth, and eyebrows, how do I go about masking these?

Would appreciate any advice.
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Old 02-15-2006, 06:18 PM
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byRo byRo is offline
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Hi there, Nick. Welcome to RetouchPRO

No problem....
1) Your first step when you first decided to blur the Green channel was to duplicate the original layer - wasn't it?

You now have two options open for you....

2a) Do what ever you want to do with the Green channel on the new layer and apply a layer mask as normal. For the Red and Blue channels (which haven't been changed) it won't make any difference whether they are masked or not, while for the Green channel the effect gets masked properly;

..or better..

2b) In your new layer open up the blending options (right click on the layer) and uncheck the R and B boxes. Now you can do whatever you want without worrying about channels at all - only the Green channel counts. Good thing with this is that you're not restricted to channels and so this way all of the tools will work.

Hope this helps.


Last edited by byRo; 02-15-2006 at 07:08 PM. Reason: got the channels mixed up - thanks Camaken!
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  #6  
Old 02-16-2006, 07:51 AM
eogg eogg is offline
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Now, thank you !
Indeed I'm on Photoshop. The fact is (I confess), I had tried to do exactly that, but it didn't seem to work at the moment... shame on me... now it works like a charm ! I'll see what I can get from it...
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