Older minilab printers are analog (optical) and directly expose the paper by shining light through the film and into the paper using an optical enlarger, before developing the paper. Newer minilab printers are digital and first scan the film, whose pictures may then be digitally corrected before being sent off to the printer, which may either expose the paper using lasers and then develop the paper, or be "dry" and essentially be a large inkjet printer. Those that develop the paper are known as Silver halide printers or minilabs. Dry inkjet minilabs are slower than their wet silver halide counterparts but consume less power, in part because dry minilabs do not need power to keep the development chemicals warm. Some minilabs may use light valves instead of lasers.