By Doug McCash, nola.com

“What is a photograph?” an exhibit tracing the history of photo techniques from 1840 onward opens at the New Orleans Museum of Art April 20 and continues through August 19. The photographs were selected mostly from NOMA’s collection by photo curator Russell Lord.

NOMA describes the scope of the show like so: “ Over the past 190 years, photography has infiltrated almost every aspect of modern life, from birth to war and science to religion. During this time, the photograph has taken many forms, such as the daguerreotype, cyanotype, and gelatin silver print. Scholars and historians have often found it difficult to write a history that gives equal weight to each of these distinct forms, but recent technical developments in photography have made it even more complicated.

“With the advent of the digital era, it appears that we must once again begin rewriting photography’s history to include not only images on metal plates, paper, and cloth, but also images on laptop screens and hand-held devices, images that have no physical support and may never physically exist at all. It has become clear that a history that narrowly defines photography as one medium is insufficient.

“Photography, it seems, is not one medium, but many.

“What is a Photograph?” describes and includes many of the most common photographic processes (daguerreotypes, salted paper prints, gelatin silver prints, and ink jet prints), but it also includes objects, artifacts, and practices that have typically been considered marginal to the history of photography (reproductions of photographs in ink, negatives, camera-less photographs, cartes-de-visite, color processes, and even a piece of jewelry).

“These disparate works invite you to consider what-if anything-links them together within the history of photography.

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