[tverbeure]

AV1 has the CfL (chroma from luma) prediction tool. h.266 has CCLM (cross component linear model) and AV2 has improved CfL.

When you see the AV2 version, it’s very similar to h.266, which is more advanced than AV1 CfL: they are using filters that cover up to 6 luma pixels to determine the chroma baseline.

The algorithm described in this blog post is pretty close to what AV1 CfL does.

[theandrewbailey]

> The algorithm described in this blog post is pretty close to what AV1 CfL does.

This checks out. I've played around with AVIF, and noticed that it kinda traces high contrast edges and smudges the rest. Higher quality settings mean less smudging.