Albinism is a complete lack of pigment. Based solely on recessive genes. In animals and humans, if both parents carry the recessive gene, then the offspring can be albino.. A Leucistic animal is entirely different.
Check this out. Scroll about halfway down for a great explanation on leucism. And a reminder that most of us have been pronouncing the word wrong lol.
http://veterinaryherpetologist.blogspot.com/