Direct transfer positive preparation by the use of the Hell chromagraph dc-300 color scanner

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Title: Direct transfer positive preparation by the use of the Hell chromagraph dc-300 color scanner
Author: Berg, Steven
Abstract: Direct transfer cylinders are usually imaged from positives created off of the camera back. In this thesis a method was proposed to create positives from a dot-generating laser scanner that would fit the requirements of direct transfer cylinders. A test gray scale was scanned and a positive produced which contained square dots as opposed to round dots. This positive was used to etch a cylinder and then the cylinder was run on the Champlaln rotogravure press, located in the school of printing. From the printed results of the first test positive a tone reproduction study was performed to determine how subsequent positives should be made to achieve an improved reproduction. A required camera curve was derived from the tone reproduction study and programmed into the scanner. The positives that conformed to this predetermined curve were chosen as the best reproductions by a panel of six jurors who were shown prints consisting of differing tone reproduction curves. The conclusions of the study illustrate that it is possible to use the laser scanner to produce direct transfer positives that fit the requirements of the system. However, it is pointed out in detail that the screened positives alone cannot fully determine tone reproduction because of the inherent problems of etching affecting cell width and depth.
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Date: 1981-03

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