XYZ prores problem

[carl]

Hi, 2.18.18 should be fine: https://dcpomatic.com/download/2.18.18

but I also uploaded 2.18.16: https://dcpomatic.com/download/2.18.16

The switch in naming of "none" to "DCI X'Y'Z'" is unrelated - it's just an attempt to make that drop-down consistent (it is supposed to specify which colourspace the given source is in, not what colour transform will be applied).

[carl]

I'd be very grateful if those who are having problems could test this build:

• Test installer for Windows
• Test installer for macOS

and let me know how you get on.

Let me know if you would like to test on Linux, and I can make an installer for you.

[Carsten]

Hi Carl - assuming I choose 'Custom' in source color space and set everything like this:

Bildschirmfoto 2025-09-20 um 15.11.23.png

Will this result in an actual 'none' color conversion? Because, for experimental reasons, it could be interesting to actually prepare some content externally and just pass through into the J2C encoder.

Or is the DCI X'Y'Z' option the same?

[TonyK]

I’m currently making a DCP now,- using version 2.18.18 and will test it on a NEC cinema projector Monday I will keep you updated

[TonyK]

And I will make one using the new build as well https://dcpomatic.com/temp/prores-snafu ... 10.10+.dmg

Thanks for your help and support on this

[StephW999]

this build (877dd7904) works perfectly. Even better than versions 2.16 or <=2.18.18. X'Y'Z' values ​​are now respected with the DCI X'Y'Z' option.

[carl]

Thanks for checking. Assuming Tony's test goes well I'll release a new version tomorrow.

[TonyK]

XYZ ProRes 4444 – Green Tint Issue in DCP-o-matic

Hi

After updating to the latest build I reopened my existing project and recreated the DCP. Unfortunately, I’m still seeing the same problem when projecting — the XYZ overlay is still apparent, and the image comes out with a green tint rather than correct colour.

The source file is a ProRes 4444 in native XYZ 2.6 gamma. I’m wondering if this could be because I reopened the older project rather than starting a fresh one, meaning the source colour space setting wasn’t picked up correctly.
I’m making a short clip now to test street away I’ll get back to you in 10 mins

[carl]

This could explain it, yes...

[TonyK]

Hi Carl and everyone,

I started a new project to test whether the issue was due to loading my old project (which may not have applied the correction properly). I can confirm that with the update 877dd7904, the conversion is now working correctly.

Thank you so much — you’re a lifesaver!