Colorimetry has been used in a variety of scientific studies to create specific color standards and visual comparisons. The standards and comparisons within this field can be of great value when evaluating color and consistently repeating data. Test results in colorimetrics through the use of spectrophotometers can give us a wealth of information about the choices we make that are dependent on color, especially those involving the foods we eat.
Color perception is the link between how the human eye perceives color and the way the brain processes that information to affect our moods and choices. Scientific research in the area of color perception has revealed that there is a great variation between how each individual sees and views color, yet our brains continually process this information in relatively the same way. The way that humans perceive color plays an important role on the choices we make, especially when it comes to our food selections.
USDA/AMS is the most general source for visual color standards for fruits and vegetables and offers a catalogue of color comparators and equipment they have available.
The USDA quality system assigns peanut butter quality rating of USDA Grade A, Grade B and Other based on 4 attributes that total 100 points.