I had this problem with large maps in an old game I wrote. My solution was to build a collision map in the form of a 2D array, but made it 3 times smaller than the actual image size. This meant it only took a ninth of the memory. The tricky bit is when you destroy a piece of the graphic the user sees, then you must clear the collision array at the same area.
Powerful PCs = New Way of Programming (I hope!)
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