Fritz F. Ebner

Finding constant hue surfaces in color space

A colorimetrically calibrated CRT display was used to measure constant perceptual hue surfaces in color space. Three hundred six points over fifteen equally spaced hue angles (every 24 degrees) in CIELAB color space were sampled. An average of 20 lightness-chroma combinations per reference hue plane was sampled. Thirty observers performed the matching task three times each. Intra-observer variation was used to weight mean observer hue matches for each of 306 colors. Analysis of perceived hue uniformity was performed in CIELAB and CIECAM97s color spaces. Other constant hue experimental results are analyzed and compared to data obtained here.

Development of a green scorecard to identify research projects for eco-efficient print engines

A ‘green scorecard’ to identify research projects in the digital printing industry is described. The scorecard is intended to be cognizant of life cycle issues without being onerous to use, allows comparison of green ‘goodness’ among scenarios, provides guidelines for use, and reduces subjectivity by requiring quantified input data. The green scorecard is neither a design tool, nor a substitute for Life Cycle Assessment; rather it is a guide for assessing eco-efficiency of research concepts in the digital printing domain, and for choosing between competing ‘green’ project opportunities.