USING HUE DIFFERENCE TO DESCRIBE AND COMPARE BI-COLOR PEAR CULTIVARS

The color of eight red pear cultivars at final harvest was analyzed using a Minolta portable chromameter.
This meter describes color in three coordinates: L*, lightness, from 0 (black) to 100 (white); a*, from -60 (green) to 60 (red); and b*, from -60 (blue) to 60 (yellow). At any level of lightness, the hue angle can be calculated as arctangent (b*/a*). Hue angle is a measure of color, which is highly correlated, with human experience of color discrimination.
The hue angles describing the sun-exposed and shaded surfaces of each red pear cultivar were used to find the hue difference: the hue angle of the shaded surface minus the hue angle of the sun-exposed surface.
A small hue difference represents greater uniformity of color, while a large hue difference indicates greater bi-color strength.
Among the cultivars studied, the greatest color uniformity was seen in ‘Starkrimson’ and ‘Gebhard Red Anjou’, while the greatest bi-color strength was in ‘Rogue Red’, ‘Cascade’, and ‘Max Red Bartlett’.

VII International Symposium on Pear Growing

D. Sugar, M.C. Dussi

Colorimeter, color, lightness, Hue-Angle, chroma

https://doi.org/10.17660/ActaHortic.1998.475.71