- From: Andrew Somers via GitHub <sysbot+gh@w3.org>
- Date: Wed, 03 Mar 2021 05:07:09 +0000
- To: public-css-archive@w3.org
Hey Chris @svgeesus > This is just the breakdown of Weber's law, no? EGADS.... gotta few hours? LOL.... Weber breaks I think well before that.... Stevens is more what `L*` follows... but also breaks... in fact, here's the ginormous stumbling block for readability contrast (that APCA does address) is that Weber, Michelson, et al are threshold based measures. Readability is _far_ supra-threshold, and due to contrast constancy and other effects, there is a pretty massive shift that causes a breakdown of all of those, Weber, Stevens, Michelson, etc etc. **As a side note, did you know that "ginormous" is now a dictionary word?** > Its (one of the reasons) why many EOTFs have a linear portion near zero, and also why HLG uses a gamma law to media white and a log law above. Yes, C. Poynton has talked a lot about how the curve is not just powerlaw or not just log, but a hybrid. > > I am presently, increasingly of the opinion that "L* is not super useful for self illuminated displays." > > You don't say why. No I don't.... at least not publicly yet... I really need to get some of these papers in better shape for review... Why do humans need sleep anyway? We have a saying in the film industry **"A film is never finished — it is simply abandoned"** .... I suspect this same sentiment applies to research as well, LOL.... > > For sRGB, I have been working on some alternatives: Ls and one possible definition is: > > Ls = Y^0.62 * 121 - 21 > > Where do these numbers come from? Has this had any peer review? They come from me, and _Nooooooo._.... This is sneak peak of something I am working on and it's from a small sample size of data and if I wasn't clear it is less-baked than a box of dry Betty Crocker mix, and probably more than I should be chatting about publicly anyway... Though CIECAM02 does presuppose some of this. Andy -- GitHub Notification of comment by Myndex Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6061#issuecomment-789433828 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config
Received on Wednesday, 3 March 2021 05:07:11 UTC