Blue/Red skin color analyzer

this is an app that takes a picture of a group of people and then decided whose skin tone is bluer and whose is redder. This goes on the assumption that blue and red blood originally comes from whether a person has more veins or arteries closer to their skin, and therefor whether more oxygen goes first to the extremities or first to the internal organs in an emergency situation, basically whether you fight or play dead. Assuming that every group of people can be divided by camera software into people with more blue or more red relatively in their skin tone.