Chaos Corona for 3ds Max > [Max] I need help!

OCIO / ACEScg

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maru:
Is your texture using an ICC profile? If yes, then the issue is that 3ds Max / Corona is not ICC-aware.
Recently there was a discussion about this.

piotrus3333:

--- Quote from: maru on 2025-04-18, 11:19:14 ---RGB primaries set to "auto" should give you the correct results.

--- End quote ---

first time loading a bitmap into CoronaBitmap follows ocio rules (sRGB by default) but then selecting Auto gives incorrect result (Linear sRGB in this case).

and why there is no "gamma 2.2 sRGB" in the drop down options? this would be the natural option to pick for users coming from old 3dsMax versions.

maru:

--- Quote from: piotrus3333 on 2025-04-30, 14:03:48 ---
--- Quote from: maru on 2025-04-18, 11:19:14 ---RGB primaries set to "auto" should give you the correct results.

--- End quote ---

first time loading a bitmap into CoronaBitmap follows ocio rules (sRGB by default) but then selecting Auto gives incorrect result (Linear sRGB in this case).

and why there is no "gamma 2.2 sRGB" in the drop down options? this would be the natural option to pick for users coming from old 3dsMax versions.

--- End quote ---

What the hell. It looks like if you load a jpg bitmap into the Corona Bitmap loader for the first time, it follows the rules set in 3ds Max. If you click "load map" and:
- double-click on your file or select your file and press enter - all is fine, it follows the 3ds Max rules
- just press enter without clicking anywhere with your mouse - then it sets RGB primaries to ACEScg
I have a weird feeling this is a 3ds Max bug, but I have logged it for our devs to investigate...

(Report ID=CMAX-1670)

maru:
Going back to the original issue: please correct me if I am wrong, but as far as I know, once you use the 3ds Max OCIO workflow, it globally applies an output transform similar to our ACES OT. This means that the images will always appear darker/different in the material editor than in the Windows picture viewer or Photoshop. You can override this in 3ds Max color management settings by unchecking "material editor" under "displays and views" and setting its view transform to "un-tonemapped". This will only change the way bitmaps are displayed in the material editor though.

If you do not specifically need to use the 3ds Max OCIO mode for some reason, I would advise sticking to the gamma workflow. If you prefer the OCIO "look" for your final image, then you can simply enable the ACES OT operator in the Corona VFB.

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