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Smartphone-based quantitative measurements on holographic sensors

Fig 4

A sample of captured images from the colour of holographic grating sensor at pH 3.00.

(A) and the corresponding pixel colour distributions in RGB (B), HSI (C) and CIEL*a*b* (D) colour spaces.

Fig 4

doi: https://doi.org/10.1371/journal.pone.0187467.g004