Control for differential colour contrast enhancement on a...

Details Control for differential colour contrast enhancement on a... Control for differential colour contrast enhancement on a...

G - Physics

09

G

375/22, 350/34

G09G 1/00 (2006.01) G09G 5/02 (2006.01)

Patent

CA 1200631

ABSTRACT OF THE INVENTION Control arrangements for the multi-colour representa- tion of characters or symbols on a screen of a display unit, by means of which, in addition to the characters or symbols, multi- colour graphic patterns and/or multi-colour television pictures can be represented, and in order to increase the legibility of the representation, those characters or symbols which are repre- sented in comparatively dark colours on a dark background are brightened relative to the comparatively light colours. In the event of the representation of graphic patterns and television pictures, the brightness of the comparatively dark colours is unchanged. The arrangement is provided in particular for the representation of characters and symbols for screen text (Interactive-Videotext) or Videotext (Broadcast Videotex).

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