Good lighting is crucial in photography and can make the difference
between a great picture and a discarded image. Traditionally, professional
photographers work in a studio with many light sources carefully
set up, with the goal of getting a near-final image at exposure
time, with post-processing mostly focusing on aspects orthogonal
to lighting. Recently, a new workflow has emerged for architectural
and commercial photography, where photographers capture several
photos from a fixed viewpoint with a moving light source. The
objective is not to produce the final result immediately, but rather
to capture useful data that are later processed, often significantly, in
photo editing software to create the final well-lit image.