Corrections for the effects of color and magnitude variations with aperture are derived. The existence of color gradient across the face of many galaxies is seen in our data.
Colors are generally redder toward the nucleus.
The gradients show a strong wavelenght dependence, similar to the C-M effect itself. The C-M effects is shown to be the same for field E and S0 galaxies as cluster and group members. Hence the effect may be universal and, further, present data provide no evidence for differences in the stellar content of early-type galaxies that depend on their environment.