“Technologies of the Image,” now at the Harvard Art Museums, is fascinated by precisely the thing that repelled many Europeans about art of the Qajar period (1779-1925)—its hybrid aesthetic, a combination of “native styles” with European sources and technology. The curators are especially interested in what they call “remediation,” that is, images made in one medium subsequently emulated in another: a painting that incorporates a photographic model, for example, or a lithograph based on a sculpture. The longer one studies them, the more absorbing they become.