Image Analysis Tools to Quantify Visual Properties of Hair Fiber Assemblies 312 yields a luminosity curve with little distinction along the tress. This is due to multiple reflections throughout the fiber assembly and a low degree of contrast between specular and diffuse reflection. The luminosity curve for treated hair reveals increased specular reflection intensity with several distinct peaks occurring and a great deal of contrast between the specular and adjacent diffuse reflection. There are several ways to calculate the differences between treated and untreated frizzy hair. One approach is to use the traditional luster methodology and equations discussed above. Each specular reflection peak would be treated separately and a corresponding diffuse reflection curve would be generated for each specular peak. Then, a luster value would be calculated for each specular and diffuse pair utilizing equations 1-6. An alternative method to quantify such light reflection curves is to calculate the difference in luminosity values between peak maxima and their respective adjacent peak minima. In conclusion, the determination of luster for frizzy hair, and also for curly, kinky, or wavy hair, depends largely on the physical arrangement of the hair fiber assembly. Also note that hair color plays an important part in luster, with dark hair exhibiting more shine than less pigmented hair. Therefore, the ability of a treatment to organize and manipulate the fibers into a given arrangement may play a more important role in increasing hair luster than the inherent optical properties of the treatment. This would suggest that de-volumizing and de-frizzing treatments are inversely related to luster when examining complex arrangements of hair fibers that have multiple specular reflection centers. Future considerations: Although a considerable amount of work in the area of hair luster has been accomplished in the last fifteen to twenty years, there still remain many experimental and analytical details that require further investigation, especially for imaging methods. Below are some key points. 1. For example, it would be worthwhile to further investigate the influence of fiber alignment and correlate fiber arrangement