Machine Processing of Halftones with Continuous Tone Developer.

Continuous tone development can be employed for processing halftones with good dot quality provided a second-generation halftone is exposed by contact and processed with the same continuous tone developer. With a process such as the indirect color separation method, which employs both continuous tone and high-contrast materials, one processor is capable of processing all materials. Details are given of a color reproduction system designed by the Graphic Arts Research Center at Rochester Institute of Technology for Copley Newspapers. This system, now in use at the Sacramento Union offset daily newspaper, caters for two parallel methods of producing separation negatives: a direct screen method and an indirect method employing an electronic scanner. Advantages and disadvantages of the system are noted and some relevant characteristic curves are given.