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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 Study Of Color Image Quality With Respect To Screen Angle Arrangement In Multicolor Halftone Printing, Ted (Te-Chung) Chen
A Study Of Color Image Quality With Respect To Screen Angle Arrangement In Multicolor Halftone Printing, Ted (Te-Chung) Chen
Theses
The advantage of using a single screen-angle (Dot-on-Dot) reproduction for multicolor halftone printing is a sharper reproduction with the decrease, of. a rosette pattern in all image areas. The purpose of this study was to quantify the differences of color image quality between conventional reproduction using four screen-angles and a single screen-angle printing technique. In addition, the influence of screen frequency to the final color image quality in the Dot-on-Dot printing was also investigated. The results of this study confirmed that there is a linearity of image quality for all color halftone printing regardless of the arrangement of the screen …
An Investigation Of The Performance Of Gray-Component Replacement, Melissa Berry Tolmie
An Investigation Of The Performance Of Gray-Component Replacement, Melissa Berry Tolmie
Theses
Members of the graphic arts industries are slowly becoming aware of undercolor reduction techniques used in the attempt to help stabilize high speed wet printing. Undercolor removal is a color correction method which follows this line of thought as it reduces the amount of ink coverage by the process-color inks and increases ink coverage of the black printer in the darker neutral areas of a reproduction. The advantages realized by this technique are carried even further with gray-component replacement (GCR) . GCR removes the process color inks that make up a dark tone and replaces them with black ink in …
The Variability Of A Web Offset Newspaper Press Run As Measured By The Eastman Kodak Company's Customized Color Analysis Target, John C. Meyer
The Variability Of A Web Offset Newspaper Press Run As Measured By The Eastman Kodak Company's Customized Color Analysis Target, John C. Meyer
Theses
The variability of a press run as measured by Eastman Kodak Company's Customized Color Analysis Target was studied and quantified in the areas of Pre-press requirements, Press Performance and Color Measurement. The test was conducted on a web offset newspaper press maintained to industry standards. The target was printed along with three halftones consisting of high-key, low-key and normal images. The halftone images were be used by the pressman to visually check and evaluate the press sheets during the run to maintain quality. A running color bar was also printed to provide densitometric readings. The test target was be evaluated …
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 …