Abstract: The scanner comprises an integrated photosensitive linear sensor (20) comprising N parallel lines of photosites, where N?4, and preferably N?6, with each line of photosites being associated with a respective bandpass optical filter. For each scanning step and for each pixel of the analyzed line, it delivers N corresponding quantized partial measurement values, each representative of the spectral reflectance of the document sensed through respective ones of the N filters. Spectral reconstruction means operate using an extrapolation method based on training from reference color samples, having a memory (42) storing a knowledge base formed from known spectral reflectance values of said reference samples, and a neural network (40) receiving as inputs the N quantized partial values and delivering as output at least one reconstituted quantized value representative of the spectral reflectance of the corresponding pixel of the document.