Over the last few years I have restored and even colorized several vintage photographs from the turn of the last century. Here is a link to some of them
Here is a fantastic book on the subject Book
There are a great many vintage photos in the public domain, one great resource is The Library of Congress
I am going to use a photograph of Mata Hari for this tutorial, you can use your own photo or this one
Here is a link to it
Usually the first step I take is to turn jpegs into Tiffs before processing, but as this photo was large enough to begin with a jpeg is fine.
One method I use to restore lost detail is to tone map the photo, any HDR processor will work. I have used photomatix and have been very happy with it. Here is a link to there site https://www.hdrsoft.com/
If you do not have access to an HDR processor and would like to use these.......
These can be found here
In Part 2 we will open these on separate layers in photoshop, until then explore create and have fun!