Input signal processing method of negative original

Abstract

Abstract PURPOSE:To discriminate easily a hue signal from a density signal by converting a negative original density signal read by photoelectric-scanning on a negative original into a density signal corresponding to a positive image so that the ratio of the weight of the three primary colors of the density signal corresponding to the positive image is made constant at all times and identical. CONSTITUTION:After the input signal obtained by photoelectric-scanning the negative original loaded to an input drum 1 is converted into the density signal by a logarithm converting circuit 2, the result is inputted to an input signal processing section 4 via an AD converter 3, where the signal is converted into a positive original density signal being the equivalent neutral density in which the ratio of the weight of the B, G, R signals is constant and identical, and then the result is inputted to a color processing section 5 to be called the heart of the system, where the signal is processed by color processing, gradation processing and sharpness processing. Thus, the density signal outputted from a color processing section 5 is inputted to a modulator 8 via an output signal processing section 6 and further a DA converter 7 so as to modulate laser light outputted from a light source 9, thereby reproducing a desired picture on an output drum 10.

Inventors

• 👤 Takao Shigaki
• 👤 卓男 紫垣
• 👤 Osamu Shimazaki
• 👤 島崎　治
• 👤 Hitoshi Urabe
• 👤 仁 卜部

Bibliographic Details