By Charles A. Poynton
Now not a programming or a recipe ebook, it is a whole reference that provides the basic options and procedures improvement of electronic video tasks. This e-book 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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Additional resources for A Technical Introduction to Digital Video
Example text
The important conclusion to take from this section is that image coding for the reproduction of pictures for human viewers is not simply concerned with mathematics, physics, chemistry, and electronics. Perceptual considerations play an essential role in successful image systems. Gamma in video In a video system, gamma correction is applied at the camera for the dual purposes of coding into perceptually uniform space and precompensating the nonlinearity of the display’s CRT. 5 opposite summarizes the image reproduction situation for video.
The 240M parameters are slightly different from those of Rec. 45 1 . 1115 0 . 0228 < R R − The difference between the SMPTE 240M and Rec. 709 transfer functions is negligible for real images. It is a shame that international agreement could not have been reached on the SMPTE 240M parameters that were widely implemented at the time the CCIR (now ITU-R) discussions were taking place. The Rec.
Having a good understanding of the theory and practice of gamma will enable you to get good results when you create, process, and display pictures. This chapter focuses on electronic reproduction of images, using video and computer graphics techniques and equipment. I deal mainly with the reproduction of intensity, or, as a photographer would say, tone scale. This is one important step to achieving good color reproduction; more detailed information about color can be found in Color science for video, on page 115.