Re: Digest for ocio...@googlegroups.com - 6 updates in 2 topics


tony cole <ton...@...>
 

Hi,
This is likely a very old request.
I am charged with setting up a global config for a new startup.
I am basing the .ocio on aces1.0.3
I'm confused on how to customise profiles, looks etc ... I do not need half of the colourspaces, ie; dolby ...
Any advice from all of you would be greatly appreciated !
Thanks

On 27 March 2018 at 04:32, <ocio...@...> wrote:
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chris....@...: Mar 12 10:43AM -0700

Hi Sean,
 
Would you please add me as well?
 
chris....@...
 
Thanks!
-Chris Davies
Sean Cooper <se...@...>: Mar 26 06:34PM +0100

Luis, Chris added.
 
If someone could make a Slack invite bot that would be useful :)
 
Troy Sobotka <troy.s...@...>: Mar 26 02:23AM

Not sure if you got help here Markel.
 
I managed to craft up a spreadsheet that should work. Should being that it
hasn't been tested extensively and that you'll need to manually make your
OCIO stanzas from the provided entries. This isn't nearly as terrific as
Colour, but I realize not everyone has Python handy, and a sort of "online
calculator" probably couldn't hurt as I found myself doing the adaptation
frequently.
 
https://docs.google.com/spreadsheets/d/1qB1YVuQFTlAKeRLyQXtOJalbZQv3V1vRPXBywqIGV_o/edit?usp=sharing
 
I've input the values you gave along with ACES AP0 primaries. The chromatic
adaptation is the Bradford CAT. The OpenColorIO stanzas appear on the final
three lines. Those should be suitable to copypasta into a configuration as
part of a group transform. Note that your source buffer will need to be
linearized however appropriate for your encoded image.
 
Let me know if anyone spots a mistake.
 
With respect,
TJS
 
Jim Houston <jim.h...@...>: Mar 25 11:38PM -0700

I checked for the first (to new primaries) and third (to ACES) Matrix Transforms and they match conversion of the colorspace to XYZ. I did not check for the middle XYZ adaptation Matrix (my spreadsheet doesn’t include that.)
 
Jim
 
 
Troy Sobotka <troy.s...@...>: Mar 26 04:34PM

On Mon, Mar 26, 2018, 9:22 AM Jim Houston, <jim.h...@...>
wrote:
 
> Transforms and they match conversion of the colorspace to XYZ. I did not
> check for the middle XYZ adaptation Matrix (my spreadsheet doesn’t include
> that.)
 
Thanks so much for the check Jim!
 
With respect,
TJS
Sean Cooper <se...@...>: Mar 26 06:32PM +0100

I'd also point you here:
http://colour-science.org/cgi-bin/rgb_colourspace_models_transformation_matrices.cgi
 
On Mon, Mar 26, 2018 at 5:34 PM, Troy Sobotka <troy.s...@...>
wrote:
 
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