avatar for Henry Wilhelm

Henry Wilhelm

Wilhelm Imaging Research, Inc.
Director of Research
Grinnell, Iowa
Henry Wilhelm is Director of Research at Wilhelm Imaging Research, Inc. in Grinnell, Iowa, USA. Wilhelm has authored or co-authored more than 30 technical papers presented at conferences sponsored by the Society for Imaging Science and Technology (IS&T), the Imaging Society of Japan (ISJ), and the American Institute for Conservation (AIC) in the United States, Europe, and Japan. With contributing author Carol Brower Wilhelm, he wrote "The Permanence and Care of Color Photographs: Traditional and Digital Color Prints, Color Negatives, Slides, and Motion Pictures," published in 1993. Wilhelm was one of the founding members of American National Standards Institute (ANSI) Committee IT-3, established in 1978. The Committee is now known as ISO Working Group 5/Task Group 3 (a part of ISO Technical Committee 42). Working together with Yoshihiko Shibahara of Fuji Photo Film Ltd. in Japan, Wilhelm served as Co-Project Leader of the Indoor Light Stability Test Methods Technical Subcommittee of "ISO WG-5/TG-3, International Standard 18937 – Imaging Materials – Photographic reflection prints – Methods for measuring indoor light stability" (58 pages) was published in January 2014. Working together with Shigeo Suga of Suga Test Instruments Co., Ltd. of Tokyo, Japan, Wilhelm is the Co-Project Leader for the development of a new ISO accelerated test methods standard for LED illumination, "ISO 18937-4, Imaging materials – Photographic reflection prints – Methods for measuring indoor light stability – Part 4: LED Illumination." Wilhelm was one of the founding members of the AIC Photographic Materials Group established in 1979. With work beginning in 1971, Wilhelm and colleagues have assembled "The Wilhelm Analog and Digital Color Print Materials Reference Collection" with associated print permanence data for samples collected during the past 47 years. Beginning in 2004, reference samples have been preserved in humidity-controlled freezer storage at minus 20°C (minus 4°F) in an ongoing program to enable existing data to be correlated with newly-developed multispectral and other color measurement systems in the future. With new color print materials, processes, and permanence data constantly being added, it is the only collection of its kind in the world.