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Comparison Of Color Lightness In Two-Color Plus Black Reproduction Systems Vs. Three-Color Reproduction Systems, Lonnie Jackson
Comparison Of Color Lightness In Two-Color Plus Black Reproduction Systems Vs. Three-Color Reproduction Systems, Lonnie Jackson
Theses
A theory that has existed since 1948 has just recently gained wide acceptance from the printing industry. The recent technological advancements in electronic scanners has made it feasible for color separations to be scanned implementing Gray Component Replacement (GCR) . Eventhough most of the electronic scanners today have GCR capabilities, some questions regarding GCR and its implementation have gone unanswered. In an attempt to help resolve this problem, this paper investigated the issue of lightness characteristics associated with GCR reproductions. In particular, this paper attempted to prove that, by replacing a graying component of a conventional reproduction made up of …
A Mathematical Analysis Of An Electronic Dot Generating Scanner For Dot Resolution And Tone Reproduction, Frederick K. Waechter
A Mathematical Analysis Of An Electronic Dot Generating Scanner For Dot Resolution And Tone Reproduction, Frederick K. Waechter
Theses
An electronic dot generating scanner is a complex machine. This complexity is based in the photographic methods which the scanner is designed to duplicate. This study addresses the mathematical principles of the entire scanner system. This paper was intended to provide an improved understanding of the scanner system. The hypothesis states that a mathematical analysis with experimental verification can be developed to accurately model the internal optics, tone reproduction, and output dot characteristics of an electronic dot generating scanner. The analysis begins with a functional block diagram, which shows the information flow through the scanner. This diagram breaks the process …
A Null-Balance Visual Densitometer, Ramon P. Baez
A Null-Balance Visual Densitometer, Ramon P. Baez
Theses
This thesis deals with the development of a Visual Densitometer, for measuring transmission density, called a "Null-Balance Visual Densitometer". This is a simple instrument made using a calibrated continuous tone negative step wedge. It was used for measuring continuous tone reference patches as used for process control of color separations, in place of an electronic densitometer. The measurements were made by a comparison between the control step wedge and the samples in close proximity over a light table. The basis for this instrument is the human eye's ability to differentiate between two areas of brightness in close proximity. The study …