1. In a computing system, a method of generating an error quantifying differences between reference objects representing characters and representations of the reference objects, the method comprising: accessing a reference object representing a character; quantifying one or more reference object characteristics, the reference object characteristics being related to character structural and color information, of at least a portion of the reference object to generate a reference object metric; accessing a representation object of the reference object; quantifying one or more representation object characteristics, the representation object characteristics being related to character structural and color information, of a portion of the representation object of the reference object corresponding to the portion of the reference object to create a representation object metric; calculating an error based on a difference between the reference object metric and the representation object metric; and outputting the error to a user.