I am a professional photo restorer and colourizer who works, for the most part, on antique sports images. But I have a great love of old Hong Kong images as well and have done a number of them.
Here is a link to my most recent work on one of John Thomson's 1869 Victoria images. 150 Years Ago! A limited number of matted prints of this image will be on sale at the Maritime Museum gift shop at the Central Star Ferry pier from the middle of March, 2019. Proceeds to the Museum.
But for those not in Hong Kong you may also purchase prints online here. (You can toggle the original photos here also)
Color references for the buildings in this image are from contemporary, or near contemporary oil paintings.
A Before & After image of this restoration can be found here. The original file is of a very high resolution, unlike this example.
I have done more, and will post here soon.