I have copies of a very detailed map of my home town from 1925 and they has been annotated with interesting facts about the people and businesses.
I want to preserve these maps digitally and here is the how I did it.
I wanted to maximize detail, so each map is combined from 28-33 different images.
Each sheet was photographed on a black background. I used a speedlight on either side of the map pointing at a 45° angle with a white umbrella
I found in my tests that Photoshop CC did and excellent job of stitching the images together so long as I overlapped them by about half.
Selected single image:
One map combined from 33 images:
The Final Product
Once all three maps were photographed and stitched I split them up and combined them into a single image.
Compressed as a JPG the file is about 50MB and is 29665 x 27536 pixels
Excluding the black background the image totals approximately 600 megapixels.
Hosting the image so that users can zoom and browse the details like google maps.