I'll follow a little bit on Andrew's comment to say that I am not sure that I see the correlation between high resolution (fit for printing) and RAW images. RAW allows you to develop an optimal JPEG image, possibly better than what the automatic settings of the camera produce, or what an inexperienced (or colour-blind, ...) photographer could do.
But I don't think that it will bring more *resolution*. This stems from using high-hand cameras, or high-hand scanners (and appropriate analog toolchain), or stitching images.
-- Rama