Figure 3-26 Photography versus CCD Images These three views of the same part of the sky, each taken with the same 4-m telescope and for the same exposure times, compare CCDs to photographic plates. (a) A negative print (black stars and white sky) of a photographic image. (b) A negative CCD image. Notice that many faint stars that are invisible in the ordinary photograph can be seen clearly in this CCD image. (c) This (positive) color view was produced by combining a series of CCD images taken through colored filters.