1. A method of providing parameters for decomposing images from first and second energy images acquired from a digital radiography imaging system, comprising the acts of: identifying energy levels of the first and second energy images; identifying a patient size of a patient being imaged by the digital radiography imaging system; identifying a filtration setting of a collimator for the digital radiography imaging system; obtaining a default decomposition parameter for the energy levels of the first and second energy images; and automatically providing a soft tissue decomposition parameter and a bone decomposition parameter by modifying the default decomposition parameter based on the patient size and the filtration setting.