The development of faster and friendlier hardware and software has enabled the use of analytical techniques based on digital image processing in a variety of applications [23,24]. Analytical measurement employing colors has been exploited in a sensor for oxygen [25]. The use of digital cameras, webcams and smartphones has enabled the development of methods for microf lowbatch analyses [26] and acid–base titrations [27,28],aswellas an alternative sensor for the detection of flame colors in photometric techniques [29] and others applications [30–35].