I'm currently writing a LUT to go from S-Log to Rec709. I've got the transfer functions for both and generally the curves I've plotted look like what I expect, but one part of the formula is bothering me. The t in the S-Log whitepaper from Sony (camera Sony - not imageworks) says t ranges from 0 to 109%.
So I've been trying to ascertain whether this means in 10bit (for example) that 1023 should be 1.09 or whether it should be 1.
A section of the whitepaper shows examples of converting between 10bit S-Log and 14bit linear. It just has some magic numbers in there and I've been trying to nail down exactly how they're calculated in order to answer the 1 vs 1.09 question. Though while I can step kinda close to it I've not just hit exact. So I'm hoping someone here can shed some light on this.
