Presenter - Jack Ladson

Jack Ladson, Color Science Consultant
Afternoon Breakout Session

A New Paradigm in Color Analytics Using Advanced Statistics Evaluating the Response Function of an Unknown Sample Set

Manufacturers of colored goods are expected to supply acceptable materials and products to their customers. The basis for color acceptability is difficult to understand and difficult to implement. The acceptance criteria are based upon producing products and components that comply with tolerances in a three-dimensional color space, created by the CIE designated CIELAB, and a total color difference metric known as CIE DE*2000. A common methodology for color acceptability of specimens that has been used for a long period of time and has wide spread acceptance throughout all industries is based upon analyzing the results of descriptive statistics applied to a total color difference metric, commonly referred to CIE DE*2000, which is based on the CIELAB color space. This total color difference metric has a Chi Square statistical distribution, which is a one-sided distribution. A one-sided distribution is characterized by the boundary from 0 to +∞. This statistical distribution is not based on the central limit theorem, which is a two-sided distribution and is characterized by the boundaries of -∞ to +∞, for which descriptive statistics are only applicable. Given the CIE DE*2000 values for a group (or batch) of specimens, this paper proposes, develops and shows a methodology that properly evaluates the acceptance of a group of specimens to determine either the initial criterion for acceptance of future batches or determines the statistical validity of accepting an unknown group of specimens into a large group of acceptable products.

Bio

Jack A Ladson is a principal in Color Science Consultancy in Monrovia, MD, and studied graduate level Mathematics at MIT. He is a past-president of the Inter-Society Color Council. He authored and presented over 40 refereed papers, one US patent, numerous international standards for ASTM International and ISO. His publications include how to assess, quantify, and determine color measurement uncertainty. He organized and chaired many color and appearance conferences. He is a recipient of the prestigious Fred W. Billmeyer Award by the ASTM in 2012 and awarded the prestigious Honorary Member Award by the ISCC in 2016. Mr. Ladson is a member of BOD of the SPE since 2007. He is a recognized expert in color and color science by the US Federal Court, a US expert in Digital Cameras, chair of ASTM E12.02 on Spectrometry and Colorimetry, E12.06 on Display, Imaging and Imaging Colorimetry, and a recognized technical expert. He is the solicited reviewer of Peter Lewis’s Chapter 14, Organic Colorants, published in the ASTM Paint Bible. He is the sole author of four international standard and guided three companies through ISO 17025 registration. He teaches color and color science on four continents and serves as an adjunct professor for PENN College, teaching industrial graduate level courses, Color, Color Science, and the Coloring of Plastics; and Weathering of Materials.