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I need to resize images to exact input dimensions (centered crop), so, I have add additional functions to Varien_Image, Varien_Image_Adapter_Gd2, Mage_Catalog_Helper_Image, and Mage_Catalog_Model_Product_Image classes.
I can easily rewrite catalog model and helper classes, but I don't know how to rewrite Varien classes. Currently, I make copies to local folder, it's not the best approach.
you cannot rewrite Varien classes and any lib classes.
It is magento feature.. but you will rewrite Mage class
so you can write Mage_Catalog_Helper_Image, and Mage_Catalog_Model_Product_Image
