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

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

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http://strkri.de/winkekatze/
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http://dascritch.github.io/testcard.html/ https://github.com/dascritch/testcard.html
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https://github.com/edent/SVGtestcard/
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