Colour Check

[William Overington]

 

 

 

 

This graphic, newly made using Affinity Designer, is based as best I remember, on the design of the Colour Check page that I designed in 1977 and which was displayed on page 786 of the Post Office's Viewdata system. I saw it on a Viewdata equipped television set in September 1977. I do not know for how long that page remained on the Viewdata system.

Please note that the design, in the teletext and viewdata format, is using lowercase letters e in graphics mode in seven colours. The design included eight different control codes, each a number of times. These eight control codes were the Hold Graphics control character and seven control codes of the form Graphics Colour, where Colour can be any one of Red, Green, Yellow, Blue, Magenta, Cyan, White.

Although designed to look as if three semi-filled rectangles, red, green, blue are overlapping, the design needed to have each of the areas encoded directly in the appropriate colour.

William