Right but the answer is not going to change if you notice I have been repeating the answer a few times here so lets break this down again as your still limited by your server. I have stated the following in this thread
1. make the ini_set line 72M
2. clear the uploads directory
3. in your upload options make sure your max image thresholds are no more than 1500
If your still getting a white page trying to process images make sure they are smaller than what your trying and not as many at a time. GD2 is part of PHP and uses PHP memory so you are limited as noted by your server. server trumps software anyday.