Volume 45 Number 1 Article 10
Year 1991 Month 1
Title: Relationship between Visual Rating and Chromaticity Values in 'Delicious' Apple Strains
Authors: S. Singha, E.C. Townsend, and T.A. Baugher
Abstract:
Fruit of 37 'Delicious' apple (Malus domestica
Borkh.) strains were harvested 149 days after
full bloom in 1988, and visually evaluated by
panelists on a 1 to 10 scale, where 10 = excellent
color.
Fruit color was measured at the mid point
between the stem and calyx end on the blushed
surface of each fruit with a Minolta Chroma
Meter CR-200b portable tristimulus colorimeter.
A simple linear regression of color panel rating
on L* value provided a R2=0.55, indicating that
this parameter influences visual color evaluation.
However, the a*/b* ratio was the best
single predictor of color rating (R2=0.63).
Although several models were tested, and many
were statistically significant, none appeared to
be better than the a*/b* ratio from a practical
standpoint.
Assessing fruit color with a colorimeter
eliminates the problems of subjectivity
associated with visual ratings and permits color
to be reported in internationally accepted units.
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