Lower hue angle value represents
a more bluish appearance while higher values represent a more
reddish tinge. The hue angles of dried blueberries from the forced
air dryer and modified impingement dryer were not significantly
different from each other. Ramaswamy and Nsonzi (1998) reported
that with heat treatment, reddish anthocyanins are converted to
a colorless carbinol base and the remaining bluish brown copigments
started to dominate the color of dried blueberries.