How Analog Color TV Works: The Beginnings

So happy to see Technology Connections here, one of my absolute favorite YouTube channels and one that I have learned a lot from. This one on "how analog tv works" I thought was especially good. ▶ this video

Alec Watson from Technology Connections did an entire series on this subject: (How Analog Color TV Works: The Beginnings) ▶ this video Then the playlist on TV stuff: link Don't blame me for the rabbit hole :P

It is good that this article exists. It explains how to convert screenshot and video capture provided by DOSBox into web-oriented formats, with some welcome considerations about pixel aspect ratio. This is a good basis! > but in these screenshots we want to retain the crisp and jagged edges that is typical of DOSBox and the old CRT monitors. Therefore we use the -sample option that does not introduce any new colours. Instead it uses nearest-neighbour interpolation (point sampling) to decide the colours of the scaled image. There are 2 ironic things: * modern world drifts away from pixel-to-pixel rendering, and indeed the web page presenting the captures constrains it (img in a div in a main with max-width:42em. So, web viewing does introduce some smoothing * the CRTs-based screens of the days were not that crisp! Especially the color ones, they had a "shadow mask", a grid of RGB spots which had no reason to be aligned with the pixel locations (this is explained e.g. on "How Analog Color TV Works: The Beginnings" by "Technology Connections" ▶ this video or jump straight to ▶ this video for explanations and ▶ this video for close-to-screen example ) > The screenshots obtained in this manner have an aspect ratio of 8:5 which makes the output look stretched horizontally. Because modern format and/or modern displaying program tend to assume square pixels, which originals were not. Same issue on Amiga (pixel aspect ratio was even different on North-American Amigas and European Amigas) and many ot