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Photo Restoration Repairing damaged photos

Restoring copy of photo with silvering

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  #11  
Old 09-05-2011, 03:12 PM
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plugsnpixels plugsnpixels is offline
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Re: Restoring copy of photo with silvering

Great work and great tips! I had a few silvered images like this in my own family collection (borrowed from a relative) and did the best I could in greyscale mode, since IMO the sepia is artificial anyway, caused by aging, and I didn't wish to keep it. Wish I had known the color channel trick!
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  #12  
Old 09-05-2011, 03:25 PM
LynetteW LynetteW is offline
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Re: Restoring copy of photo with silvering

Thanks, plugsnpixels! I had never worked on a silvered photo before. I was tearing my hair out because none of the usual remedies were working, and was so grateful to come across this thread.
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Old 09-05-2011, 03:48 PM
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Re: Restoring copy of photo with silvering

I bet your client was happy. That's a nice shot well restored.
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  #14  
Old 09-13-2011, 09:18 AM
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Re: Restoring copy of photo with silvering

LynetteW - great job on the restoration!

Lurch, thanks again for the original post! I've found it most helpful with some old family photos.
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Old 09-18-2011, 11:32 AM
LynetteW LynetteW is offline
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Re: Restoring copy of photo with silvering

Thank you, Tori.
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  #16  
Old 07-08-2012, 03:01 PM
4N6site 4N6site is offline
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Arrow Re: Restoring copy of photo with silvering

You can also directly remove the silvering using color deconvolution. No masks or fiddling needed: you apply the same process to the whole image at once. The results often recover detail that was not visible anymore. The color deconvolution plug-in is available from 4N6site.com (check out some more examples here). I have attached the 3 clicks result!

Quote:
Originally Posted by lurch View Post
Here's a paraphrase of a method for getting rid of silvering that's included in Ctein's book 'Restoration from Start to Finish'. It's quick and easy.

You've already observed that the silvering in this case is blue-ish. With that knowledge, add a hue/saturation adjustment layer (temporarily) and increase blue saturation until the silvering is pretty obvious. I used about +60. Note that sometimes silvering is more green than blue - in that case you up the green saturation instead. While the saturation-increase layer is visible, check the individual channels. In this image the red channel has a decent version of the image, while the blue is noticeably lighter where the silvering occurs. You want to make that lightness more pronounced so you can make a mask for the silvering.

So now you have blue channel with silvering showing. And you have a red channel with little if any silvering showing. You want to subtract the red channel (image info) from the blue one (image info + silvering info) to get a channel with just the silvering info, more or less. Remember this is all with the hypersaturated layer visible. I use calculations, where I apply the inverted red channel to the blue channel with the blending mode 'add' and send the output to a channel. After a little fiddling with the values in the offset and scale boxes you end up with a new channel that is mostly gray with light areas where there's silvering. Any time after you generate the new channel you can trash the hypersaturated layer. To make the new channel a little smoother, I apply a Gaussian blur - in this case about 2 pixels. For a mask you want the gray to be black, so increase the contrast with your method of choice. I use curves. My mask is the third attachment.

Takes about two minutes to make that mask after a little practice. Certainly way less than it takes to describe the process. Once you have the mask, load it as a selection and make a curves adjustment layer. The resulting layer mask will limit your curves action to the silvered areas. In this image, darkening the blue channel makes the silvering haze go away. In other images you might have to tweak the green also, and maybe the RGB.
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File Type: jpg family-color-deco.jpg (100.0 KB, 56 views)
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