SMPTE ST 293M PDF

This standard defines the digital representation of stationary or moving two-dimensional images for television production. The representation is sampled linearly in the spatial domain and sampled temporally at a constant frame rate. The scanned image has an aspect ratio of 16:9. The scanning format details are given in table 1. This standard includes both R',G',B' and Y',C'B,C'R expressions for the signal representation.

The principal application of this standard is for the production of content for EDTV-II, which employs an NTSC letterbox encoding scheme, compatible with SMPTE 170M.

NOTES

1 R'G'B' and Y'C'BC'R refer to nonlinear ''gamma'' corrected signals derived from the linear components arising from the analysis of the image which are denoted as R,G,B, etc.

2 The signals C'B,C'R refer to digital expressions of the color-difference signals. The signals P'BP'R refer to the analog color-difference signals. Although this standard defines the digital representation, references to analog signal representations are given where considered appropriate.

3 The primary purpose of this standard is to specify the parameters of the active area of the image. An additional set of parameters is included for real-time applications that consist of the frame rate, vertical and horizontal blanking, and total number of lines. The values of these parameters are included in table 1.

4 The term ''line'' in this standard refers to the digital line in the 483-line frame raster as described in figure B.1. In the case of an analog video signal, the word ''analog line'' is used. The line numbering is based on the 525 digital line numbers as described in figures 1 and B.1.