In re: https://colourise.sg
Not much to say as this is a simple web interface into a powerful auto-colorizer. It is trained on a set of Singaporean images and supposedly works best with humans and nature.
Some examples from my favorite b/w shots and scans:
The first thing that happens once you upload is you get a slider to sweep the before and after.
There is a button to let you download the result by itself. My old Tmax 100 tabby photo shows scant colorization.
Road 22, Cu Chi, Vietnam
Other technologies we have investigated: