To determine the
grade of quantitative difference of Hue parameter with reference
to grey color the chroma (Cr.) was calculated using the formula:
Cr ¼ (a*2 þ b*2)1/2. The hue angle H is the qualitative attribute of
color and it defines the difference of a color compared to grey in
the orange juice. This was calculated using the formula: H ¼ arc
Tan (a/b).