I've come across references to digital minilabs, which project digital photographs onto standard photographic paper and then develop them using the same chemical processes as traditional film development. (See, for example, http://en.wikipedia.org/wiki/Minilab#Digital_minilab and http://en.wikipedia.org/wiki/LightJet.)
How does this projection actually work? Typical digital projectors almost certainly lack the resolution and color range to faithfully reproduce digital images on photo paper. The LightJet article loosely describes a process involving lasers.
Does anyone know of a detailed technical explanation (outside of the ones in the linked Wikipedia articles)?