In this paper, we numerically quantify the information capacity of a sensor, by examining the different factors than can
limit this capacity, namely sensor spectral response, noise, and sensor blur (due to fill factor, cross talk and diffraction,
for given aperture). In particular, we compare the effectiveness of raw color space for different kinds of sensors. We also
define an intrinsic notion of color sensitivity that generalizes some of our previous works. We also attempt to discuss
how metamerism can be represented for a sensor.