[DCP-o-matic] P3 to XYZ conversion matrix

Here's a question for the list! :) Any suggestions, anyone? ---------- Forwarded message ---------- Date: Tue, 14 Oct 2014 16:16:10 +0100 From: Anand Madabushi <armadabushi(a)gmail.com> To: carl(a)dcpomatic.com Subject: P3 to XYZ conversion matrix Hi Carl, I've got a feature film that's currently sitting in DCI-P3 colour space. I'd like to use a custom matrix to convert this space to XYZ using your awesome software. You currently have 3 presets, but not a P3 one. I've scoured the web trying to find a 3x3 matrix to do this conversion and even tried to calculate one mathematically - with no success. I would assume others have tried to do something similar. Any idea where I can find a conversion matrix for P3 to XYZ? Many thanks, Anand Madabushi Outsight Films, London