dithering

Note: the main subject of the video is about digital vs analog signals, but he explains dithering as well.

They might have saved as a 256 color GIF (resulting in the dithering) before re-encoding to PNG.

And many games used dithering type patterns to represent fine detail instead of blended colors, eg.

With the dithering you have a statistical guarantee that the quantization errors average out.

Evidence: LCD based portable systems and line doubled mode 13h DOS games both used the same dithering techniques, but they had sharp pixels.

Now, obviously most people don't have 10-bit screens or so, so dithering the video down to 8-bit is still required at some point.

And even TN, there are differences in quality, my x60 had one of the ugliest, the bit dithering and pixel gap was amazingly bad.

It's a different type of lossy, and I think dithering noise is more suitible for manga-style drawings than jpeg noise.

However, due to the large smooth color surfaces, you pretty much always need to use dithering in order to have truly smooth-looking gradients in 8-bit.

If you want a dithering transition as you scroll, do that.

Yes, as described in the article, this is just dithering.

If you have the startup itch and want to teach yourself good habits, here's my advice: Don't dither, and don't pick up habits that encourage dithering.

The broadest is basically "random noise can be used to improve signal." Under that definition, dithering would be a form of stochastic resonance.

I once won a code golf "popularity contest" competition that was about dithering a grayscale image.

I don't know what the "worst" thing would be but some places where I think there are clouds (pun intentionality uncertain) on their horizon - in no particular order: 1) Culture fail: leading to dithering and waste that swamps the ship.

CGA's "Composite" mode contains output artifacts, a trait also found in other early microcomputer graphics like those of the Apple II or Atari 800; with careful use of dithering, CGA can be expanded to a larger effective gamut[0] although most games wouldn't be as ambitious as this demo.

Dithering kills your compression savings in GIF so you'd want to avoid it if possible.

Dithering works on standard linear processes (like adding noise to images).