https://c3voc.de/wiki/_media/testbild_1080p.png

https://git.franzi.business/kunsi/infobeamer-testcard/src/branch/main/testcard.png

http://strkri.de/winkekatze/

http://dascritch.github.io/testcard.html/ https://github.com/dascritch/testcard.html

https://github.com/edent/SVGtestcard/