Use Maxwell Render's PyMaxwell tool to read the active color space

maxwell_color_space.py

# Get the Color Space
# Example: scene = Cmaxwell(mwcallback); colorSpace = mxa_getColorSpace(scene)
def mxa_getColorSpace(scene):
  colorSpace = ''

  colorSpaceValue = scene.getColorSpace()
  if colorSpaceValue == COLOR_SPACE_SRGB:
    colorSpace = 'sRGB IEC61966-2.1'
  elif colorSpaceValue == COLOR_SPACE_ADOBE98:
    colorSpace = 'Adobe RGB'
  elif colorSpaceValue == COLOR_SPACE_APPLE:
    colorSpace = 'Apple RGB'
  elif colorSpaceValue == COLOR_SPACE_PAL:
    colorSpace = 'PAL'
  elif colorSpaceValue == COLOR_SPACE_NTSC:
    colorSpace = 'NTSC 1953'
  elif colorSpaceValue == COLOR_SPACE_NTSC1979:
    colorSpace = 'NSTC 1979'
  elif colorSpaceValue == COLOR_SPACE_WIDEGAMUT:
    colorSpace = 'Wide Gamut RGB'
  elif colorSpaceValue == COLOR_SPACE_PROPHOTO:
    colorSpace = 'Pro Photo RGB'
  elif colorSpaceValue == COLOR_SPACE_ECIRRGB:
    colorSpace = 'ECI RGB'
  elif colorSpaceValue == COLOR_SPACE_CIE1931:
    colorSpace = 'CIE 1931'
  elif colorSpaceValue == COLOR_SPACE_BRUCERGB:
    colorSpace = 'Bruce RGB'
  elif colorSpaceValue == COLOR_SPACE_COLORMATCH:
    colorSpace = 'ColorMatch RGB'
  elif colorSpaceValue == COLOR_SPACE_BESTRGB:
    colorSpace = 'Best RGB'
  elif colorSpaceValue == COLOR_SPACE_DONRGB4:
    colorSpace = 'Don RGB 4'
  elif colorSpaceValue == COLOR_SPACE_REC709:
    colorSpace = 'REC.709'
  elif colorSpaceValue == COLOR_SPACE_ACES:
    colorSpace = 'ACES'
  elif colorSpaceValue == COLOR_SPACE_UNKNOWN:
    colorSpace = 'unknown'
  else:
    colorSpace = 'unknown'

  # print('[Color Space] ' + str(colorSpace))
  return colorSpace