towne32 said:

Someone asked this before and I'm not sure if there was an answer. But, if going the route of a single correction applied to an entire film, is there a way to simply make an LUT out of the original and modified frame?

In essence, that's the output of the algorithm (for the single color space model). For 8 bit and 16 bit images this can be done, exactly. However, for the exr images this is not possible, as there are an infinite number of possible color combinations, which is why it is a HDR image format.