It's hard to get in the era of ubiquitous 32 bit color depth, but back in the day, part of the show was making merely your hardware output picture very close to the reference in as many colors as possible and good resolution too. This was where Amiga's special video modes could really shine.

Thus, some demos, like the one where Lazur's image came from [0] were just slideshows of very colorful images that were more than likely traced from something.

[0] https://www.pouet.net/prod.php?which=3715 https://www.youtube.com/watch?v=FmhffwhGiK0