While confining ourselves to digital photography (instead of digital art),I don't understand why we cannot treat digital photography as an art. First of all the question arises as to if photography is an art at all .Just as all photography may not have the characteristics of an art,all digital photography is not art.Having accepted this,we may go on to treat digital photography as an art sharing  common characteristics with other forms of art. A digital photograph enables you like any other art to express your uniquely artistic vision and the techniques used in composition and editing are the tools of an artist as in any other form of art. Each work represents a unique spatial consciousness and records the drama of human actions just as in any form of aesthetic expression.