I’m trying to restore a 75 year old Anscochrome Super Slide, but are new to this type of editing. How would one go about minimizing the red artifact that’s across the middle of the image? Thx.
Try using a Control Line and adjust the Luma & Chroma sliders to select the red hue. Then adjust saturation and brightness to see if you can remove it.
I am sure there are others methods so experiment.
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I agree with @KeithRJ. Use a mask to target the red. A control line will help you avoid the brick wall behind.
Given the actual colours are quite muted, you have the option of dropping the saturation first before trying to deal with the actual colour cast. Don’t forget you can also use negative control points in the same mask for problem areas.
It looks to me like a control line dragged up would fit best, and you might need a negative control point on the wall beside the man’s shoulder.
When judging how to place the gradient, remember you can often see better where it needs to be after making the adjustments. E.g. if it looks good, but the red is leaking through at the top, move it up, or tighten/loosen the gradient.
This is the beauty of non-destructive editing. I’ve taken out blurred fence wires across the corners of photos using a similar approach and it can take many goes to position it just right, but it’s usually obvious when it’s not in the right place.
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I used a Hue mask combined with a control line and some manual brushes to get this result:
First, I selected the reds with a hue mask, than I added a control line to only get it effecting the bottom half of the image. With a brush, I tidied up some parts like the brick wall and the hand of the man.
As settings. I moved the reds more towards greens, set the luminance to -59 and saturation to -88. Contrast to 55 and exposure to -0.83.
After that, there was a dark shadow/band under the red artifact. I lightened that up with a brush with low flow and opacity.
Hopes this helps you.
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Thanks everybody! Using a combination of your suggestions I got the image as good as it gets in my book. I left the background a bit prominent, as that’s an old elementary school important to the story that the image tells my family.
Here’s the original scan, and my finished output.
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Inspired by the initial remarks from @KeithRJ and @zkarj I had experimented and prepared some screenshots. – But then I was out … 
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with a Control line
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with the Auto brush
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continued with other settings
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and finally the orange tone
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@calvingrinder, just seeing your result … it looks good!
And yes, one needs to combine various methods.
greetings, Wolfgang
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