A couple of days ago I saw on the internet some photo statistics with average man and average woman from different regions around a world.

The average women face around the world

The average mens face around the world

An interesting question it’s How are made?

There are made using many layers of photos with opacity (alpha value). This means if we want to do mean of 3 photos we need to put 3 overlapping photos with 33% opacity for each. In many cases we can’t obtain a very sharp image. For example above photo results are photoshoped after overlapping.