2.6. Color attribute measurement
The L*, a* and b* values of color components were measured with a Chroma Meter following the method of Watanabe, Yoshimoto, Okada, and Nomura (2011). Fresh SJ should be bright red. Hence, the L* values indicating color from light to dark and a* values indicating color from red to green were analyzed. Meanwhile, the b* values indicating color from yellow to blue were ignored.