Upvote:1
There is a hobomap of Luang Prabang, mentioning two copy shops:
copy shop : FP122, FU126 stationery & copy shop : FP122
The Laos Yellow pages also mention two photocopy equipment shops in Luang Prabang:
[...]
Note that the first one seems to be more of a shop selling photocopiers and printers.
Now whether any of these offer colour printing is something to be verified in person.