Fig. 1

a Series of 8 photographs representing angled view (45°) of portion sizes of cooked red rice. Photographs are shown in increments of 100 g, as 8 portions from 100 g to 800 g, in the ascending order. b Series of 8 photographs representing aerial view (5°) of portion sizes of cooked red rice. Photographs are shown in increments of 100 g, as 8 portions from 100 g to 800 g, in the ascending order