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Published online by Cambridge University Press: 04 August 2017
The apparent colors in a flux-complete sample of galaxies depend on the redshifts and the spectral types in the sample. These in turn depend on both luminosity evolution and evolution of the shapes of the spectra. Thus in principle a great deal about the evolution of galaxies can be learned from complete multicolor surveys, especially now that large samples can be routinely generated by automatic machine measurement. The following will review what has been learned from recent work.