What kind of video artifact is this?

[orion44]

Could someone please tell me what kind of video artifact is this, and how do I fix it:

https://guide.encode.moe/encoding/images/3cnvimage102.png

[Selur]

aliasing?

[poisondeathray]

There are several types of artifacts . Which one(s) are you referring to ?

[orion44]

In the middle of the picture on the right, on the red hair, there are very tiny 'dots'.

What has caused it?

[Selur]

Looks like some line darkening or similar darkeing ringing artifacts.