Rigon, J. P.G. [UNESP]Capuani, S. [UNESP]Fernandes, D. M. [UNESP]Guimarães, T. M. [UNESP]2018-12-112018-12-112016-12-01Photosynthetica, v. 54, n. 4, p. 559-566, 2016.0300-3604http://hdl.handle.net/11449/172646The development of smartphones, specifically their cameras, and imaging technologies has enabled their use as sensors/measurement tools. Here we aimed to evaluate the applicability of a fast and noninvasive method for the estimation of total chlorophyll (Chl), Chl a, Chl b, and carotenoids (Car) content of soybean plants using a smartphone camera. Single leaf disc images were obtained using a smartphone camera. Subsequently, for the same leaf discs, a Chl meter was used to obtain the relative index of Chl and the photosynthetic pigments were then determined using a classic method. The RGB, HSB and CIELab color models were extracted from the smartphone images and correlated to Chl values obtained using a Chl meter and by a standard laboratory protocol. The smartphone camera was sensitive enough to capture successfully a broad range of Chl and Car contents seen in soybean leaves. Although there was a variation between color models, some of the proposed regressions (e.g., the S and b index from HSB and Lab color models and NRI [RGB model]) were very close to the Chl meter values. Based on our findings, smartphones can be used for rapid and accurate estimation of soybean and Car contents in soybean leaves.559-566engcameracolor modelmathematical modelsnondestructivephotosynthetic pigmentsportable equipmentArtigo10.1007/s11099-016-0214-xAcesso aberto2-s2.0-849601084072-s2.0-84960108407.pdf