Nuke: Red wideGamut to sRGB matrix?

Hiya…

can some one please confirm what matrix would convert a

  • Linear srgb (cg)
    to
  • Linear REDLog3G10 (converted to linear via OCIO 1d)…

This is to comp cg in nuke with working space of red Linear.

Is this Correct Please?
from ocio:
Input - RED - Linear - REDWideGamutRGB
[0.785043, 0.083844, 0.131118, 0, 0.023172, 1.08789, -0.111055, 0, -0.073769, -0.314639, 1.38854, 0, 0, 0, 0, 1]}

redMatrix

p.s. I understand that ACEScg would be a preferable working-space, but we have already started the show.

thx. rafal

Hi Rafal,

No this is incorrect, the matrix (assuming you want RED Wide Gamut RGB) would be as follows:

[[ 0.5419710236  0.3601646194  0.0979367359]
 [ 0.0769296461  0.7680017846  0.1550375610]
 [ 0.0588396717  0.2735065260  0.6676122457]]

You can compute them as you wish using this App: https://www.colour-science.org:8010/apps/rgb_colourspace_models_transformation_matrix, https://www.colour-science.org/apps/

Cheers,

Thomas

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perfect!

i’ve got a fish, and i can get my own next time.

thankyou Thomas

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