Avian Rochester, LLC: Measurement Geometry

Measurement Geometry Basics: Introduction

Measurement geometry plays a critical role in the definition of object colors. The reasons for selecting one geometry over another are many, and we cannot explore all the details here. For now these pages explain how each geometry works. The CIE nomenclature for measurement geometry is Θ_i:Θ_d. Θ_i is the angle of incident light (source) and Θ_d is the angle of detection (collection). There are additional modifiers that better specify the subtleties of each measurement type. These are described on the pages linked below.

Bidirectional Geometry (also called 45:0 or 0:45)
Hemispherical Geometry (also called d:0,0:d, d:8, 8:d, etc)
Alternative geometries (gonio measurements)

Information for you

Why choose Avian?

Capabilities

Standards Development

Who we work with

External Sites

Tutorials on measurement geometry

What is traceability?

Our work with the Library of Congress

Latest News

On October 2019, Dave Wyble presented the paper "Heading Down the Profiling Rabbit Hole" at the Joint CORM, CNC,CIE, and CIE-USNC meeting in Ottawa, Canada.(more)
NEWS FLASH! As of August 2019, Avian Rochester has entered into an exclusive marketing agreement for our Next Generation Camera Target with our trusted partner DT Cultural Heritage, makers of preservation-grade digitization solutions. (more)
In March 2019, Dave Wyble attended the joint TAGA/ ISCC in Minneapolis, MN. (more)

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