Reflectance Transformation Imaging

RTI is a computational photographic method that captures a subject’s surface shape and color and enables the interactive re-lighting of the subject from any direction in a software viewer, revealing details not visible with the naked eye.

Capture - Instructional guide and videos

Process - RTIBuilder free software

View - RTIViewer free software

RTI Kit - Learn more about and buy an RTI Starter Kit


Photogrammetry is the science of measurement in imaging. The photographer captures a set of images of a single subject following a rule-based procedure and then creates a textured 3D digital surface that can be measured with a known precision.

Capture - Instructional videos

Scale Bars - Learn more about and buy calibrated scale bars

Digital Lab Notebook

Digital Lab Notebook is a term coined by CHI for a digital record of the means and circumstances used to generate a digital representation of an imaging subject. DLN tools simplify the collection of scientific, standards-based metadata.

DLN:CaptureContext - Version 1 Beta software

DLN:Inspector - Version 1 Beta software

CHI Forums CHI offers a free online forum site where you can share your questions, insights, and issues to gain a more complete understanding of RTI, photogrammetry, and related practices, and learn more about their practical applications. How are museum conservators, computer scientists, natural scientists, photographers, and other related professional groups using these technologies? What problems are they solving and what challenges are they facing? Join the conversation!

$50 suggested donation

Overview of Imaging Technologies

Learn about the imaging technologies fostered by CHI.

Hands-on Training Classes in RTI and Photogrammetry

CHI offers regular 4-day training classes for groups of up to 15 people at our studio in San Francisco. Or have CHI imaging experts come to your site and customize training and services based on your requirements.

Need Some Help?

CHI offers customized consulting services to both institutional and private clients, with special rates for nonprofit organizations. Projects of all sizes can be accommodated.

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