Digital Color Management: Encoding Solutions, 2nd Edition

7

Projected Images

Projected images can be created using any of a variety of image display technologies, devices, and media. Examples include optical projection of photographic slide films, optical projection of motion picture films, and electronic projection using laser, CCD, or DLP technologies. Yet despite differences in the underlying technologies that might be used to generate them, virtually all forms of projected images share certain fundamental colorimetric characteristics and relationships to original scenes. Based on the discussions of the preceding chapters, it is not unexpected that the colorimetry of projected images is very different from that of original scenes. What might not be expected is that the colorimetry of projected images also differs significantly from that of the electronic display and reflection-print systems described so far.

In this chapter, the colorimetric characteristics particular to projected images will be analyzed, and the reasons why those characteristics must differ from those of other forms of image display will be explained. The discussion will begin with a study of the colorimetric properties of photographic slide films—in part because of their historical importance, but more importantly because their fundamental colorimetric properties are representative of those of all projected images. The colorimetric properties of other projection media and devices and other related modes of display also will be shown. Finally, several important ...