EXIF data says that images was generated using Photoshop CS3, which was released in 2007.
Because I can't find it easily online.
"Berners-Lee made a webpage to advertise events taking place at CERN and uploaded Gennaro’s picture of the band. The image was tiny—only around 120 pixels by 50 pixels—because the early web would have struggled with larger images. It was about the size of a stamp".
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