Originally Posted by Elix
This is such a great topic I think it deserves to be necro'ed! sotti and andrewfee never gave us a formula for their reverse BT.709 curve. I wish I knew it so I could use it in an excel spreadsheet to calculate target values for my display.
We now have a standard for gamma, the BT.1886 function
, which takes your display contrast into account and calculates a curve tailored to its limitations. If the display can exceed 10,000:1 contrast, then it should be set to a 2.4 power curve.
The BT.709 curve is not intended to be used on displays, and while it might be interesting to see how the "compensated" BT.709 curve they suggested compares with BT.1886 on certain displays (I suspect the "1.2" version
could end up close) there's no need to debate anything now, unless you want to debate whether the BT.1886 spec should actually be applied or not.