Rec.709 actually defines a peak luma of 100 nits. sRGB has it defined as 80 nits. These numbers are really only for mastering, but as you push further from the standard you start to see artifacts, namely banding in gradients.
HDR standards require higher bit depth and define higher peak brightness. In addition, and this is probably technically the toughest bit, they define dynamic metadata formats which define tone mapping as the content changes [0].
One thing you may be missing about the particular effect we see on this website is that it disappears as you turn your device brightness up. So you can still get that brightness with SDR content.
HDR standards require higher bit depth and define higher peak brightness. In addition, and this is probably technically the toughest bit, they define dynamic metadata formats which define tone mapping as the content changes [0].
One thing you may be missing about the particular effect we see on this website is that it disappears as you turn your device brightness up. So you can still get that brightness with SDR content.
[0]: https://www.avforums.com/articles/what-is-4k-hdr-dynamic-met...