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Near infrared absorbance spectra of 2427 oilseed rape samples. Spectra were acquired on wavenumbers from 4000 to 12,000 cm−1 and shown before pretreatment (A), after a pretreatment using standard normal variate (SNV) (designated by the OPUS8.1 software as the optimal pre-treatment for the N predictive model) (B), and after a combined pretreatment using SNV and first derivate (designated by the OPUS8.1 software as the optimal pre-treatment for the C predictive model) (C).
