By Charles A. Poynton
No longer a programming or a recipe ebook, this can be a whole reference that offers the basic ideas and tactics improvement of electronic video initiatives. This publication is designed for technical humans now not already video specialists who have to layout, construct and program--hardware and software--systems that come with video.
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Extra resources for A Technical Introduction to Digital Video
2. Emerging display devices such as liquid crystal displays (LCDs) have nonlinearity different from that of a CRT. 6 Rec. 709 transfer function. 0 Light intensity, relative well matched to perception. 45 value are very well established. The economic importance of equipment that is already built to these standards will deter any attempt to establish new standards just because they are better matched to particular devices. We can expect new display devices to incorporate local correction, to adapt between their intrinsic transfer functions and the transfer function that has been standardized for image interchange.
In a practical system such as a television camera, in order to minimize noise in the dark regions of the picture it is necessary to limit the slope (gain) of the function near black. Rec. 018, and stretches the remainder of the curve to maintain func102 A TECHNICAL INTRODUCTION TO DIGITAL VIDEO tion and tangent continuity at the breakpoint. In this equation the red tristimulus (linear light) component is denoted R, and the resulting gamma-corrected video signal is denoted with a prime symbol, R’709.
CHAPTER 1 BASIC PRINCIPLES 31 Gamma This is Chapter 6 of the book A Technical Introduction to Digital Video, by Charles Poynton, published in 1996 by John Wiley & Sons. 6 In photography, video, and computer graphics, the gamma symbol, γ, represents a numerical parameter that describes the nonlinearity of intensity reproduction. Gamma is a mysterious and confusing subject, because it involves concepts from four disciplines: physics, perception, photography, and video. This chapter explains how gamma is related to each of these disciplines.