How to allocate more heap?

Hi,.
I have an issue to be resolved.
I used maxMemory() method to check the heapsize which returned 66M
and totalMemory() as expected 2M which i extented to maxMemory() using -XM options.
However i have to deal with images as large as 72M and even more.
Is there any possible way to increase heap beyond maximum available memory?
Do you guys have any other suggestions?
Regards.

Thanks for the suggesstion it helped a bit but hasn't completely solved my problem. i tried upto 800M
While scaling images i get OutOfMemoryError().
Can this be because i m maintaining 2 buffers of 4928*4928*3 and one of 512*512*3 and maybe the call of scaling images does a lot of buffering for itself?
I was wondering whether i could deallocate one of the buffers forcefully?
Is there any way to do this in java?
Anything else???
Regards.

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