Stuart Humphryes collected 200 early color photos from about 1885-1920, and revitalized them with the latest color technologic enhancements to the point you can not tell these were scratched, faded, tinted, and color shifted

Boy in his monoplane on rue Greneta (near Les Halles) in Paris, France, photographed by Léon Gimpel, 19 September, 1915

Humphryes uses an algorithm to average out the difference between adjacent pixels in an image, which smooths and blends the individual spots of colour into a more coherent image that can be enlarged without it breaking up into constituent coloured dots. Neural networking technology then enhances and sharpens the detail. Finally, the results are upscaled to high definition

See a dozen or more for free at https://www.gosee.news/news/art/gosee-loves-the-colors-of-life-early-color-photography-enhanced-by-stuart-humphryes-a-captivating-journey-through-time-into-a-colorful-past-63068

https://www.theguardian.com/artanddesign/gallery/2023/oct/04/now-with-added-colour-early-photographs-reborn-in-pictures-stuart-humphryes-the-colors-of-life

 The Colors of Life is about $75 https://www.amazon.com/s?k=9783967041231&i=stripbooks&linkCode=qs