A full width array spectrophotometer for full width scanning color analysis of
color test targets, with one or two substantially linear elongated arrays of closely
spaced multiple LED illumination sources of plural different color emissions in
a multiply repeated pattern of at least three or four different colors transversely
spanning a printer paper path and sequentially illuminated to illuminate a transverse
band across a printed sheet moving in the paper path, and a corresponding elongated
low cost light imaging bar with a parallel and correspondingly elongated array
of multiple closely spaced different color sensitive (three or four rows of color-filtered)
photodetectors, which imaging bar is positioned to detect and analyze light reflected
from the transverse sequentially illuminated band.