On Nov 28, 2013 4:49 AM, "Ashley Retallack" <ashl...@...> wrote:
> Thanks for the reply. If I was to do this in a nuke context what would the process be, it this no different to doing an unpremult before color transform and a premult afterwards?

The predivide has to happen prior to TRC inversion.

If the issue is alpha / luminance based, the read node has a “Premultiplied” radio box.

This should take the associated alpha image, predivide it, apply the inverted TRC / transfer curve, then apply the alpha again.

If you attempt to do a similar thing from within a Nuke node chain, the error would already be baked into the data buffer.

With respect,
TJS