On the pizzabox.computer blog is an interactive visualization of what a video signal looks like at any particular moment drawing a circle on a video screen.
The image on the (bottom) is a simple static image that I was able to output as a video signal (NTSC-M). I attached an oscilloscope to the video output, and recorded an image for each line in the picture area (for my oscilloscope’s video trigger, that’s line 21 through 262). I only took screengrabs of the lines in field 1.
By moving (a) slider, you can look at the trace of each video line.
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