Still learning my self but i would try moving your subject away from the background and lighting it with a flash, it can be done in editing programs but its something to sort out before the shot as that's more of a time waster.
Post processing you could try the level's adjustments but being as you look to have used a single light source it could still be very difficult. As mentioned above you need to light the background of the sheet and using a water spray a few hours before can help reduce the creases...
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