RTI Lighting Array
For Automatic Acquisition of Reflectance Transformation Imaging (RTI) and Associated Techniques
A lighting array is a combination of hardware designed to light and capture photographic image sequences and software that operates the apparatus and data capture. A lighting array is optional equipment but one that makes capturing and processing the imaging data much more efficient for the user.
Note: At this time, Cultural Heritage Imaging (CHI) is no longer offering a lighting array. We are currently exploring other options for this equipment. If we have helpful information to share, we will update this page.
Why a Lighting Array?
CHI has fostered a community of users who use the RTI highlight method to document objects, museum collections, and sites. Anyone with a digital camera and reflective spheres (spheres are included in the RTI Highlight Capture Starter Kit, also offered by CHI) can employ the RTI imaging technique. The simplicity of this model has led to a widespread use of the technology.
Advantages of a Lighting Array
- An array is a multi-featured structure with an integrated electrical control system.
- The frame has custom fixtures that safely secure all optical, illumination, and electrical components.
- The stability of the frame safeguards the imaging subjects per conservation requirements.
- One person can easily operate the array.
- No need to place spheres in the image as you do in Highlight RTI capture.
- No need to calculate light positions for each image; in an array the light positions are precalculated.
- The computer-automated, 45-light capture sequence takes 2.5 minutes.
- The array provides a faster pipeline for capturing and processing RTI data compared to the highlight method.