Proposed New RGB Gamut Display with True Color Saturation and Value Scales

In the days of composite signals, the Vector display was used for precise video synchronization and timing due to the sensitivity of the color sub-carrier phase and resulting Hue to genlock and timing jitter. With component distribution and production, the Hue is not so sensitive to timing errors and other methods are used for relative component timing assessment. However, the Vector display remains a popular analysis tool for assessing the artistic color characteristics such as Saturation and sometimes the signal range or gamut of a video signal. However, the Vector display does not allow the determination of the actual color Saturation or color Value (vividness) as is often believed nor does it provide a useful indication of a valid RGB signal gamut. In fact, there is no commonly available real-time Waveform or Vector type XY display that directly indicates the color Saturation or color Value of the signal along with conformance to valid RGB signal limits. There is a need then for a new display tool that clearly shows the artistic metrics of color Saturation and color Value or Lightness combined with RGB gamut limits allowing a colorist to adjust live video signals into a valid signal gamut range such that the desired image quality is maintained throughout distribution. Similarly, there is a need to determine the impact on the artistic color quality of any gamma/matrix conversion or signal limiting during distribution due to various format conversions and legalizer processing. Therefore, this paper proposes and describes the application of a new real-time display technology in the format of a simple, 2-dimensional, triangular color space bounded by the so called “valid” color gamut RGB signal limits.

Published

2009-10

Content type

Original Research

DOI

10.5594/M001343

ISBN

978-1-61482-943-0