[ttml2] On the gamma approximation in luminanceGain (#1070)

cconcolato has just created a new issue for https://github.com/w3c/ttml2:

== On the gamma approximation in luminanceGain ==
From a discussion with @joedrago:
> a minor note about SRGB's transfer function. SRGB's transfer function approximates much closer to a gamma of 2.2, despite the value of 2.4 being present in the only exponent of the function. Here is a reference from color.org indicating its approximation:
http://www.color.org/srgb.pdf
And here is a Desmos graph showing 2.2, 2.4, and SRGB: 
https://www.desmos.com/calculator/az6xrrvj8v 



Please view or discuss this issue at https://github.com/w3c/ttml2/issues/1070 using your GitHub account

Received on Monday, 22 April 2019 23:36:21 UTC