Hi RV: sorry to confuse with this. 

Cobaltdream asked for the details of sRGB correction a few posts back. The shader I showed above is just an sRGB version of the very simple Output Gamma Correction calculation that we have been using here in this thread.

To explain briefly - Gamma Correction using a curve with a power of (1/2.2) is an approximation to accurate output correction to true sRGB colour space. The difference is only really noticeable at very low illumination levels, like deep shadows.

I did think it would be better to have a separate thread for this sRGB thing, but it showed up here. I agree it would be good to get back to basics in this thread!

Sorry.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)