Color vision system to assess English walnut ( Juglans Regia ) kernel pellicle color

•A color vision system (CVS) was designed to predict walnut kernel color.•The CVS removes bias, adds reliability and speed to the color evaluation process.•The CVS depicts walnut color with less variability than a colorimeter measurement.•The CVS can be used during commercial and breeding walnut kernel color grading.•Color predictions models per cultivar are more reliable than a full generic model.