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Photo Restoration Repairing damaged photos

green channel query

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  #1  
Old 03-12-2006, 01:06 AM
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aylaah aylaah is offline
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green channel query

Hopefully a quick one

I've discovered and played with the green channel for retouch and just have a quick question about the results.

Once I go back to viewing as RGB full colour, I get greenish marks (and sometimes other colours). Why?

Is this a simple case of 'overdoing' it? Or is there something else I'm doing wrong? Is it more to do with what specifically, I retouch on that channel?

The green channel in itself is brand new to me.
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Old 03-12-2006, 02:38 AM
Xaran Xaran is offline
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You would really need to post before and after pictures for anyone to give assistance on this.

Christine
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Old 03-12-2006, 04:11 AM
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aylaah aylaah is offline
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Here is a picture with the effect I'm talking about.

I've used healing brush to retouch some of the face, by using the green channel as a working space. When I go back to colour, this is what I see.

If you look at the forehead and laugh-lines as well as under the eye on our left you can see a green 'glow'.

I've tried this on various quality images - this one is just one of mine that isn't good quality but on professional shots in original size (which I can't put here, sorry, copyright) it has the same effect.
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File Type: jpg 000_1098col copy.jpg (77.1 KB, 65 views)
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Old 03-12-2006, 04:13 AM
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aylaah aylaah is offline
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oh - and going over those areas visible in the other channels just means I see red and blue where the green is as well.
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Old 03-12-2006, 08:34 AM
Xaran Xaran is offline
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If you can post a before picture we may understand exactly what it is you are trying to do. Normally manipulating a single channel is only done to remove a colour cast, not for retouching.

Christine
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  #6  
Old 03-12-2006, 09:26 AM
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shellby shellby is offline
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Retouching on a channel

You can retouch on each channel BUT ensure that all the channels are highlighted when you select the green one.

See sreenshot below.
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File Type: jpg Correct.jpg (12.4 KB, 33 views)
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Old 03-12-2006, 10:17 AM
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mistermonday mistermonday is offline
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Aylaah, the color of each pixel in a RGB image is determined by the values in the respective channels. When ever you change any value in a channel you will change the color of the associated pixels. Shelby's advice will allow you to see what effect you are having on the composite image as you are making changes on any of the channels.
Regards, Murray
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  #8  
Old 03-12-2006, 10:29 AM
Cassidy Cassidy is offline
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As per shellby otherwise, unpredictable results will follow
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