Method of displaying individual colours by substituting them by grey values

Abstract

Abstract In telecommunications services such as videotex, colours edited for the most part without taking ìnto account possible monochrome display provide only a poor quality of reproduction on monochrome monitors. To improve the contrast of monochrome reproduction , for each colour in the colour memory (17) of a conventional decoder (2), in a weighting device (19, 20) associated with the colour memory (17), the relevant colour luminosities are determined; grey values are allotted to these with intensification of the contrast, and stored in a grey-value memory (21) in the same sequence as the colours in the colour memory (17) and the grey values are retrieved, in parallel to the colours, from the grey-value memory (21) for display on a monochrome monitor (7). The method in accordance with the invention permits improved monochrome reproduction of images in telecommunications services such as videotex. <IMAGE>

Inventors

• 👤 Gerald Dipl.-Ing. Schmidt
• 👤 Manfred-Rüdiger Sellke

Bibliographic Details