What is the best format of proxy to use when you work with S - Log in a linear colourspace?

I worked with a few images from Sony F55 shot against a green screen. I work in a 16 bit s - rbg colourspace

I did out of the source proxies that were photo-jpeg SBDAs, nice fast n.

However, it is fixed the color values in the proxy with what looks like an s-curve that did eventually my overlay significantly different parameters (IE much more contrasted) when switching between the proxy and original.

So, what would be the best way to go on the conversion of some sequences of newspapers-s to a fast proxy format without messing with settings main effects by such an amount of annoying. I can live with a small difference of course.

Thanks in advance.

Since you are seized, I work with the original film, not proxies and just deal with the problems of time.

You will not get a precise key with a proxy... which is what you need.  Or you COULD work quickly and with no more worries with a proxy and get an incorrect key, but I doubt that is your goal.

Tags: After Effects

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