 In attractiveness studies, averageness is one of the characteristics of physical beauty in which the average phenotype, i.e. outward appearance, of the individual theoretically characterizes averaged genotypes, thus indicating health and fertility. The majority of averageness studies and theories have to do with photographic overlay studies, in which images are morphed together. Other factors involved in measuring attractiveness are symmetry and youthfulness.
History
In 1883, Francis Galton, cousin of Charles Darwin, devised a technique called composite photography, described in detail in Inquiries in Human Faculty and its Development, which he believed could be used to identify 'types' by appearance, which he hoped would aid medical diagnosis, and even criminology through the identification of typical criminal faces. In short, he wondered if certain groups of people had certain facial characteristics. To find this answer, he created photographic composite images of the faces of vegetarians and criminals to see if there was a typical facial appearance for each. Galton overlaid multiple images of faces onto a single photographic plate so that each individual face contributed roughly equally to a final composite face. While the resultant “averaged” faces did little to allow the a priori identification of either criminals or vegetarians, Galton observed that the composite image was more attractive than the component faces. Similar observations were made in 1886 by Stoddard, who created composite faces of members of the National Academy of Sciences and graduating seniors of Smith College. This phenomenon is now known as "averageness-effect", that is highly physically attractive tend to be indicative of the average traits of the population.
 In 1990, one of the first computer-based photographic attractiveness rating studies was conducted. During this year psychologists Langlois and Roggman wanted to systematically examine whether mathematical averageness is linked to with facial attractiveness. To test this, they selected photographs of 192 male and female Caucasian faces; each of which was computer scanned and digitized. They then made computer-processed composites of each image, as 2-, 4-, 8-, 16-, and 32-face composites, averaged by pixel. These faces, as well as the component faces, were rated for attractiveness by 300 judges on a 5-point Likert scale (1 = very unattractive, 5 = very attractive). The results showed that the 32-composite face was the most visually attractive of all the faces.
Methodology
In 2005, as an example of using image morphing methodology to study the effects of averageness, imaging researcher Pierre Tourigny created a composite of about 30 faces to find out the current standard of good looks on the Internet (as shown above). On the popular Hot or Not web site, people rate others’ attractiveness on a scale of 1 to 10. An average score based on hundreds or even thousands of individual ratings takes only a few days to emerge. To make this hot or not pallate of morphed images, photos from the site were sorted by rank and used SquirlzMorph to create multi-morph composites from them. Unlike projects like Face of Tomorrow or Beauty Check where the subjects are posed for the purpose, the portraits are blurry because the source images are low resolution with differences in posture, hair styles, glasses, etc, so that here images could use only 36 control points for the morphs. A similar study was done with Miss Universe contestants, as shown adjacent.
Koinophilia
It makes biological sense that sexual creatures should be attracted to mates sporting a predominance of common or average features. Natural selection results, over the course of generations, in beneficial (or "fit") features replacing their disadvantageous counterparts. This is the fundamental force which drives evolution, and is the major insight into Biology which immortalized Charles Darwin. Thus, natural selection causes beneficial features to become increasingly more common with each generation, while the disadvantageous features become increasingly rare. A sexual creature, therefore, wishing to mate with a fit partner, would be expected to avoid individuals sporting unusual features, while being especially attracted to those individuals displaying a predominance of common or average features. This is termed "koinophilia".
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