Numerous image editing techniques are available to easily produce realistic synthetic images. Such techniques include, for example, cutting and pasting, in-painting, alpha matting, synthesis, etc. Image editing techniques are often utilized by the movie industry to synthesize special effects in movies without leaving noticeable visual artifacts. Although image editing technologies can greatly enrich the user experience and reduce certain production costs, realistic synthetic images (i.e., altered/doctored images) can also be substantially problematic. For example, use of doctored images in news reporting and photojournalism could threaten the legitimacy of using digital images for reporting purposes. In such scenarios, technologies to determine whether content of a digital image has been altered would be substantially useful.