1. A method for processing digital images, the method comprising: processing, by a computer system, a digital image using a visual database to generate an image classification, the image classification including a first term and an associated probability value indicative of a probability that the first term accurately describes the digital image; generating, by the computer system, a subset hierarchical tree based on a lexical database, the subset hierarchical tree including the first term and a plurality of other terms from the lexical database, the first term and plurality of other terms sharing a common parent and arranged in a hierarchy based on specificity; calculating, by the computer system, probability values for one or more of the plurality of other terms in the subset hierarchical tree based on the probability value associated with the first term; identifying, by the computer system, based on the calculating, a second term from the plurality of other terms that is broader than the first term and that has a calculated probability value that satisfies a specified criterion; and generating, by the computer system, an output to a user based on the identified second term.