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Measurement Problems for Overhead Projection Transparency Printing Color Calibration

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The color quality of overhead projection transparency is affected by the transparency print, the projector, the projection screen, and the viewing environment. For color calibration, there are commercial measurement instruments capable of transparency sample spectral and color transmittance measurement. However, projection stray light, sample scattering as in samples printed with EP technologies, and projector design parallax limitation as in reflective-type projectors makes using measured transmittance data to represent the projected colors inadequate. In this paper, we report our effort and findings on overhead projection transparency color measurement and calibration. We devised an automated measurement system based on a spectroradiometer to measure multiple projected colors automatically; the results are compared with that obtained by direct sample transmittance measurement with both diffuse illumination and collimated illumination. We concluded that projected colors should be measured for superior overhead projection transparency color calibration to compensate for regular stray light, sample scattering, and projector optical design limitations.
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Document Type: Research Article

Publication date: January 1, 2001

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

    Please note: for Purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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