I haven't put much time and research into it yet, so I can't help you
with the aces workflow.
However, be careful with the AlexaLogC colorspace. Since its gamut is
different, if you only change the colorspace from linear to logc without
changing the primaries, you could end up with slightly off colors when
converting to aces. It depends on the logc to aces conversion. I don't
know what gamut it expects from the logc images.
On 31/08/2012 05:13, Schneider, Abraham wrote:
Hi there!
I just played around with the OCIO nodes/modes in Nuke 6.3v8. I also
had a look at the ACES workflow/config from the opencolorIO.org
website. I've added this 'aces' config to Nuke by adding the
config.ocio as the custom config.
Seems to work fine so far. But there is one thing in this whole
setup/config that I doesn't really get: how do I use sRGB/rec709/video
footage (stills and/or movies) in a ACES environment? Normally I'd
assume to switch the Read node to raw and/or linear (because the Read
doesn't support OCIO yet), add a OCIOColorSpace, set IN to something
like sRGB/rec709/etc. and the OUT to aces, to convert the image to the
ACES colorspace. But there is no IN setting for sRGB/rech709/etc.! I
can convert ARRI logC, analog film scans (cineon coded), sLog, etc.,
but not 'video' or other display referred encoded material (neither in
the iff config coming by default with Nuke nor in the aces config from
opencolorio.org). So how am I supposed to use still images, video
stock footage, etc. in an ACES workflow in Nuke?
Only way I tried it at the moment was to switch the Read to "sRGB" (or
rec709 or gamma 2.2 etc.), add a normal Colorspace after the read that
converts from linear to AlexaV3LogC and add a OCIOColorSpace with IN =
'logc' and OUT = 'aces'. Seems to work, but doesn't seem to be a
clever way.
Do I miss something or is this just not supported at the moment in
this ACES config/workflow? Using the 'spi-vfx' config in comparison,
there is the option to set the IN to 'vd8' or 'vd10' or something like
that. But 'spi-vfx' is not using the ACES colorspace, right?
Abraham
Abraham Schneider
Head of VFX pipeline / VFX Supervisor
ARRI Film & TV Services GmbH
Tuerkenstr. 89
D-80799 Muenchen / Germany
Phone +49 89 3809-1269
EMail [email protected]
www.arri.de/filmtv
________________________________
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Handelsregisternummer: HRB 69396
Geschäftsführer: Franz Kraus, Dr. Martin Prillmann, Josef Reidinger
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