Comment Law is more subtle than pedantic programmers (Score 1) 512
Most of the comments here are annoying riffs on the theme, "I can read the word 'manipulation' in a pedantically absurd way and pretend there is no distinction". In fact, law and courts can use common sense, definitions, and human reasoning. They are not constrained to crudely written algorithms (even sophisticated algorithms could do better than most posts here allow, but that's a digression too).
As TFA says, photojournalism already has a fairly well defined standard about what "modifications" are merely technical versus which alter the meaning of the material presented. Part of this is a question of particular transformations that may or may not be applied, but much of it is a matter of judgment about meaning. Clearly, at the edges, you can try to subvert some overly narrow and hyper-technical construal. For example, Man Ray (and other photographers of the early 20th C) created some strikingly abstract and recontextualizing images using only techniques that would no per-se bump against the technical "modification" techniques... his purpose was obviously much different than fashion magazines, but if a modern photographer applies the same devices, the law and courts would reasonably call that "manipulation" within the spirit of the proposed law (whether labeling was required would presumably depend on the publication context). On the flip side, there are no doubt other photographs that could be "manipulated" in a formal sense without intending to present artificial meaning. For example, photos (digital or film) that are damaged in various ways might need to be "manipulated" to produce the "true" image. Again, courts and laws can make that distinction on a case-by-case basis.