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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.

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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

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