The effect of processing conditions on the process yield of anthocyanin powders is shown in Fig. 1. In the spray drying experiment, the process yield ranged from 64.07 to 82.16%. Increasing the inlet air temperature led to a higher process yield. Using a high inlet air temperature could reduce the proportion of sticky powder attached to the chamber wall of the spray dryer (Kunapornsujarit & Intipunya, 2013). The smaller amount of sticky powder in turn resulted in a higher process yield. Nayak and Rastogi (2010) explained that increasing the maltodextrin DE value led to an increase in wall material thickness. A higher DE value will dry more slowly than a lower DE value at the same temperature. For this reason, the anthocyanin powders produced from BRM30 had a higher wetted surface, resulting in a higher proportion of sticky powder. Using an air inlet temperature of 180 °C and BRM20 provided the highest process yield. However, the process yield of all of the freeze dried powders was higher than that of any of the spray dried powders, because of the different type and size of chamber used for drying.