Its hard to tell without a pic, but its probably sun burn. It should grow new leaves that are normally colored. I thought my pineapple was dead because its leaves were all spotted with lots of black and gray (after complete neglect indoors to a point where I forgot it existed), but some more water and full sun was enough to make some healthy green leaves grow out from the center. Now Im wating for it to replace the old leaves so it looks nice and healthy again!
-Alex

One of the problems could be cold night temperatures. Pineapples come from NE Brazil where night temperatures never fall below 15C 60F. In early/late summer in NY temps can fall below this. Keep it indoors in a sunny position all the year round. - Ian.