Gamma and linear matrix
Although the look of an image can be adjusted at the time of acquisition (see Customizing the image, page 98) or in post production, the picture the viewer will finally see depends on the characteristics of their TV set. The cathode ray display tube, however, has certain limitations. The television image is created by a stream of electrons bombarding a phosphor coating on the inside face of the display tube. The rate of change of this beam and therefore the change in picture brightness does not rise linearly, in-step with changes in the signal level corresponding to the changes in the original image brightness variations.
Gamma correction
(a) Gamma due to tube characteristic
(b) Gamma correction
As shown in graph (a) ...
Get Basic Betacam Camerawork, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
