Restoring copy of photo with silvering

[djohnston33]

I have a scan of a photo of my great uncle and his family, the original was approx. 100 yrs old. The original belonged to a relative who has since passed away. Therefore there is no way to rescan or photograph the original to eliminate the silvering. All I have is the digital copy. I have tried to get an acceptable result without success. Any help would be greatly appreciated

[lurch]

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.

[Dave.Cox]

Excellent write up Lurch

[lurch]

Thank you Dave!

[amica999]

Originally Posted by Dave.Cox

Excellent write up Lurch

Second that!

[Gary]

Originally Posted by djohnston33

I have a scan of a photo of my great uncle and his family, the original was approx. 100 yrs old. The original belonged to a relative who has since passed away. Therefore there is no way to rescan or photograph the original to eliminate the silvering. All I have is the digital copy. I have tried to get an acceptable result without success. Any help would be greatly appreciated

Another way is to desaturate completely, lighten with curves and levels adjustment layers, denoise and add a color tint.

[0lBaldy]

Thanks Lurch.. worked like you said..
Because the girl on the right was darker and sort of sepia, I decided to lighten her and apply a sepia like tone.

A little cloning and healing and it should look pretty good

[djohnston33]

Thanks a million Lurch. I never dreamed that you could get a result like you did, and so fast! I had been fighting with this problem for several days and my results looked worse than the original.