On 7 May 2016 00:09, "Randy Little" <randyslit...@gmail.com> wrote: > > So if you have a log scan there is no means in ACES to actually linearize it so that its really linear. other than use normal loglin which is fine. Nothing in ACES will make DLAD greypatch 445. If that patch does measure 445 than the file can't be linearized from its log state. It must have a transform of some kind. Is that the intended operation or just something not included in ACES as mentioned early. I think.
If you have a film scan, it is really quite tricky to make it really linear no matter what curve you pick. However ACES does provide ADX conversion to unbuild the film scan to ACES, and then from that you can go to other spaces. You would need a scan that was reasonably well set up to output ADX. As to 445 being special and magical it isn't really not if you use the Cineon curve, ADX and some other curves are more based around the Lad concept than Cineon. If you do have a scan set up to place ~18% reflectance near 445, you may be better using a plog style conversion which would avoid the complexities of the unbuild but you won't be scene referred linear especially in the toe and shoulder. You would then need something to handle conversion from the film scan primaries into your chosen colour space. This all depends how important "really" linear is. Kevin
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