Example images of rice cv. Fatmawati taken 20 d after salt application. Salt stress was imposed two weeks after transplantation. From left to right: image of rice treated with 0 mM, 100 mM, 150 mM and 200 mM NaCl. (A) Side view RGB images of rice plants. (B) Identified object after image analysis for size measurement. (C) Top view RGB images of the same plants shown in A. (D) Corresponding fluorescent images taken from above. (E) Colour classified images derived from fluorescence images in D, where green depicts healthy leaves and purple indicates senescent areas. Bars = 10 cm.