Early Color Television Spectrac Color ConverterThe Spectrac color converter was developed in Canada by Frederick Topping. It used a rotating belt with two color filters in front of a black and white set to produce color images. Popular Science, December 1971 1971 Paper on Spectrac (courtesy of Mike Sauer) Invisible text to format smartphones. xxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx |