Derive duotone "colours" from an existing photo

[jrickards]

I like the way this photo (https://www.flickr.com/photos/152818709@...d-public/) looks and would like to apply a similar style to other photos.

I realize that the photo has vignetting and softening but what I'm not clear on is how to take a black and white photo and map the range of grays to the same tones in this photo. This photo was converted to this style using an in-camera style which is why I don't really know how it was done in-camera.

Is it possible and if so, how might it be done?

Thanks,

Jules