Thesis - Open Access
Master of Science (MS)
Journalism and Mass Communications
The purpose of this thesis, therefore, is to investigate a system of no-screen bump or highlight exposure (so-called because it is the highlight area of the negative that is affected) based on logarithmic densities and opacity tables. The system under investigation used in shooting the copy. R. E. Maurer says that 11 a contact screen is a light modulator that is placed in contact with the halftone emulsion. The small, vignetted dots in the photographic screen absorb the exposing light selectively so that the proper intensity distribution is produced in the halftone emulsion." The second exposure is the flash, which is used as an additional exposure for copy with a long density range (i.e. too much contrast). The third type is the no-screen bump, which supplements the main exposure and affects the highlight area of the negative. This last exposure is used to adjust screen range to the density range of the original copy. The main exposure is achieved by placing the film on the vacuum back of the process camera and covering it with the contact screen, emulsion to emulsion. After the main exposure, the contact screen is removed and a short no-screen bump exposure is given to the film. When supplementing the main exposure with no-screen exposure, the former must be reduced in length. Carlson asserts that "to establish a no-screen bump procedure, the main exposure will be shortened and a no-screen bump added to place the same size standard, normal highlight dot size or whatever dot size is required for reproduction in the first step of the Gray Scale.”
Library of Congress Subject Headings
Number of Pages
South Dakota State University
Horwood, Stephen E., "An Experimental Study of No-screen Bump Exposures for Short Density Range Reflection Copy" (1972). Electronic Theses and Dissertations. 4711.