There is now a trend toward a careful staging and lighting of the picture, rather than hoping to "discover" it ready-made. Photographers such as Gregory Crewdson, and Jeff Wall are noted for the quality of their staged pictures. Additionally, new technological trends in digital photography have opened a new direction in full spectrum photography, where careful filtering choices across the ultraviolet, visible and infrared lead to new artistic visions.As printing technologies have improved since around 1980, a photographer's art prints reproduced in a finely-printed limited-edition book have now become an area of strong interest to collectors. This is because books usually have high production values, a short print run, and their limited market means they are almost never reprinted. The collector's market in photography books by individual photographers is developing rapidly.