5. Conclusion

HD images have inherited, on the one hand, the standardized parameters originally used in black-and-white and then color SD television (luminance/chrominance components, chrominance sub-sampling, interlaced analysis/display, etc.) and, on the other hand, parameters derived from IT (progressive analysis/display) and cinema (24 fps). They therefore fall somewhere between SD video and digital cinema. But while the multiplicity of values for native HD image parameters allows a choice of initial quality levels, it also makes format conversions difficult.

The high native HD bitrate makes it necessary to reduce this bitrate for storage or transport, using various formats and compression tools along the HD chain. This is the subject of the next document