| 摘要 |
An electronic print exposure analyzer for providing a direct indication of optimum paper grade and automatic control of exposure time in photographic printing. A pair of photosensitive probes provide a pair of signals representative of the intensity of the darkest and lightest portions of a projected image. A measuring circuit converts these signals to a setting of a variable resistance. The variable resistance controls the setting of a paper grade indicator, and also controls duration of an exposure time circuit.
|
