def retire(self, key):
        val = self.data.pop(key)
        self.total_bytes -= self.nbytes.pop(key)
Get bounding box of actual data (non-zero pixels) in image
dataset/ETHPy150Open blaze/cachey/cachey/cache.py/Cache.retire--crossover with--dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/site-packages/PIL/Image.py/Image.getbbox