all oscars you can buy in the trade are lutinos. true albino oscars are very very rare and in all my years of fishkeeping i have yet to encounter one or even a picture of one. even though the lutinos are listed as albinos they are not. they are actually Leucistic (lacking or mostly lacking chromatophores. Not a true albino) but for marketing purposes are listed as albino.
this is problem that is rampant in oscars mainly because the lutino can come in a pure white form.
hope some of this helps you in understanding oscar or fish colouration.
i found a link to a more indepth breakdown of fish colouration
www.oscarfishlover.com/index.php?option=...=6&limitstart=36