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RTIViewer developed by CHI and some of our collaborators is open-source software that allows you to view and explore Reflectance Transformation Imaging (RTI) files at very high resolutions. Learn more about RTI and related technologies and download the RTIViewer tool, some sample files to view, and the User Guide.

“Dynamic Shading Enhancement for Reflectance Transformation Imaging”

RTI image from ACM Journal on Computing and Cultural Heritage

About This Publication

Authors Gianpaolo Palma, Massimiliano Corsini, Paolo Cignoni, Roberto Scopigno, Mark Mudge
Published in ACM Journal on Computing and Cultural Heritage (JOCCH), Volume 3 Issue 2
Publication Date September 2010
Available from CHI Download the paper


In this paper, we propose a set of dynamic shading enhancement techniques for improving the perception of details, features, and overall shape characteristics from images created with Reflectance Transformation Imaging (RTI) techniques. Selection of these perceptual enhancement filters can significantly improve the user's ability to interactively inspect the content of 2D RTI media by zooming, panning, and changing the illumination direction. In particular, we present two groups of strategies for RTI image enhancement based on two main ideas: exploiting the unsharp masking methodology in the RTI-specific context; and locally optimizing the incident light direction for improved RTI image sharpness and illumination of surface features. The Result section presents a number of datasets and compares them with existing techniques.