So Apple RGB = sRGB primaries + gamma 1.8 + custom tone curve . Windows 10/11: Right-click the .icc file → “Install Profile” → Then in Photoshop or Affinity, assign/convert to it under Color Settings.
Double-click the .icc file → it installs automatically to /Library/ColorSync/Profiles (user) or System (requires admin). Then choose in ColorSync Utility or app preferences. 6. The "gotcha" – modern displays If you assign Apple RGB to an image on a modern 2.2 gamma monitor, it will look darker/more contrasty than intended unless you also view it on a display calibrated to gamma 1.8 (rare today). Use relative colorimetric intent when converting to sRGB for web. Want the actual file? I can’t directly host it here, but I can give you a step-by-step terminal command to extract it from a real Mac (if you have access), or guide you to a public archive like Internet Archive’s Apple Legacy Software Collection – search for “Apple ColorSync Profiles 2.0”. apple rgb color profile download