Research

The RIT TAGA student chapter is committed to furthering student education within the graphic arts. The following is student authored research published in our most recent technical journal.
For the full article, please contact rittaga@rit.edu.

Experimenting With Soft Proofing Environments

Author: Sri Hemanth Prakhya

The current ISO specification for soft proofing, ISO 12646:2008,
requires the monitor to be shielded from the incident light of the room or the light in the hardcopy viewing booth. This dark surround for the monitor causes a contrasting effect in the visual comparison to a well-lit hardcopy. For experimentation, this environment has been modified by placing the monitor side-by-side, at the same plane with the hardcopy in a viewing booth to make the comparison much more straightforward. Neutral gray masks were placed on top of the monitor and the hardcopy, so both of them have a common surround. After monitor calibration and profiling, the light intensity of the viewing booth was adjusted to make the monitor display look like an image printed on a piece of paper.

25 observers found that soft proofing comparisons with this setup were much more comfortable than with the previous ISO conforming setup.

A Mathematical Model that Corrects for the Presence of OBAs in a Brightened Paper

Author: Brian Gamm

This paper presents a new method for creating a mathematical model that corrects for the presence of optical brightening agents in brightened paper. Four characteristics of spectral reflectance curves were used to create the model. The model curve, called the zerocurve, was fit to two characteristic points as a function of the ratio between the spectral reflectance of the maximum emission and the maximum absorption of a fluorescent sample spectral reflectance curve. The color difference between the zero-curve and the actual spectral reflectance of a paper containing zero optical brightening agents was, on average, less than one ΔE00.

Non-Recycled vs. 100 Percent Post-Consumer Waste Substrates: Preliminary Comparison Tests in a Digital Printing Environment

Author: Joseph Schember

This research will serve as a preliminary study of the effect of post-consumer waste material in a substrate in terms of physical characteristics and printability factors. The physical characteristics included in this study are smoothness, opacity, brightness, and caliper. A comprehensive dot analysis (including area, perimeter, shape, and dot gain) will serve as the basis for the printability comparisons. Substrates including 100 percent post-consumer waste material will be compared against equivalent substrates that include no recycled content. The effects of varying basis weights will also be analyzed. For the purposes of this exploratory study, the testing environment will be isolated to a digital printing environment utilizing a dry-toner, electrophotographic imaging process.

Characterization of Thermal and Piezoelectric Print Heads in a Microgravity Setting

Authors: Christopher Ubelacker, James Craven, Gregory Sharp, and Jarret Whetstone

Thermal and piezoelectric inkjet print head technologies comprise a large majority of the current printer market share. This technology has been designed and used effectively with good results in its normal environment on the Earth’s surface. The Rochester Institute of Technology Imaging and Photographic Technology team participated in the 2008 National Aeronautics and Space Administration Reduced Gravity Student Flight Opportunities Program and tested the ability of current inkjet printing technologies to function in a microgravity setting. Testing was done on an Epson R280 Printer that utilized thermal print head technology and a Kodak EasyShare 5100 Printer that used piezoelectric print head technology. This experiment involved both high-speed imaging of ink drops as they were ejected from the print head, along with quality testing of the printer. These tests were performed using specially designed printing test-targets that measure density, resolution, fine line detail, and registration, which provided characterization02 data of the printer functionality. Included in this paper are explanations of the testing design, the results, and suggestions for printer modifications and further studies.