Why do some images initially load fast but look grainy, then fully load and “clear up”, while other images just take longer to load, but load in “full quality”?

Question

Why do some images initially load fast but look grainy, then fully load and “clear up”, while other images just take longer to load, but load in “full quality”?

In: Technology

Answer 1

Some image formats allow a low level resolution preview, others do not. This is why some come in grainy first on a slow connection. After it loads partially, you can see it.