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• Slack invite - 2 Updates
• Converting Primaries - 4 Updates

Slack invite

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 :)

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Converting Primaries

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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