transition.to doesn't seem to support color transitions. So I made one myself using enterFrame, which is how I suspect corona's transition library works too.
A game that give you a first contact with Programming Logical aspects. Made as a requirement to the PGP discipline at the brazilian university IFSP. Almost all the documentation and code comments are in portuguese.
Converts your hex (html-format) or RGB values into Corona-compatible format (numbers from 0 to 1). No difficulties, only two functions: hex('value') and rgb(rNum, gNum, bNum).