Color Shift - Cross-universe RGB Panel with RGB LED Strips

[sbenejam]

Describe the bug
Colour Shift on Universe Change using cross-universe feature
See: https://www.qlcplus.org/forum/viewtopic.php?p=76779#p76779

To Reproduce
Steps to reproduce the behavior:

1. Create an RGB Panel with 30 columns x 10 rows
2. Mark Allow Cross-universe
3. Components RGB
4. All other options as default
5. Click OK
6. Go to Function Manager and create a new RGB Matrix, solid color Red
7. Test the new RGB Matrix
8. The first universe pixels lite in Red
9. The second universe pixels are Green

Expected behavior
The pixels of the two universes must be turned on in red.
For RGB LED strips use a maximum of 510 channels per universe. For RGBW LED strips it is correct to use 512 channels per universe.

Desktop (please complete the following information):

• OS: Ubuntu 24.04
• QLC+ 4.14.1-GIT
• Enttec Octo MK2
• RGB Led strip

Additional context
It seems that Enttec Led controllers (maybe other brands too) on universe change when using a RGB led strip are not using channels 511 and 512. Universe split to next universe occurs after channel 510. It allow to use 170 RGB pixels per universe.

On Enttec website I found this document: https://support.enttec.com/support/solutions/articles/101000399069-pixel-troubleshooting-installations

[mcallegari]

Hey @sbenejam we tested cross universe on a real installation and it does what it says.
It crosses even a single pixel, while what you are asking is to preserve pixel layout across universes.
Obviously it can be done, but is it still the concept of cross universe?
@yestalgia thoughts?

[sbenejam]

I have done some searches on the network and it seems that many controllers avoid using the 511 and 512 channels in the case of RGB LED strips. Maybe you could add an option to choose how to make the jump to the next universe. I have seen that Enttec, Wled or Madrix for RGB led strips jump to the next universe on channel 510 fills 170 RGB pixels per universe. I don't know if there are controllers that allow cross-universe in channel 512 using LED channels in two consecutive universes. Adding 3 options to configure the cross-universe to fit users needs. - Option 1: Split RGB at 510 to allow use Enttec an other brands controllers. - Option 2: Split RGB at 512 - Option 3: Split RGBW at 512 Maybe @yestalgia can give us his expert opinion on this case. Missatge de Massimo Callegari ***@***.***> del dia dg., 9 de març 2025 a les 19:34:

…

Hey @sbenejam <https://github.com/sbenejam> we tested cross universe on a real installation and it does what it says. It crosses even a single pixel, while what you are asking is to preserve pixel layout across universes. Obviously it can be done, but is it still the concept of cross universe? @yestalgia <https://github.com/yestalgia> thoughts? — Reply to this email directly, view it on GitHub <#1694 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABO5H43O2AC3YXPNM3VOPH32TSCRRAVCNFSM6AAAAABYUO6JQKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMBZGAYDMNBZGY> . You are receiving this because you were mentioned.Message ID: ***@***.***> [image: mcallegari]*mcallegari* left a comment (mcallegari/qlcplus#1694) <#1694 (comment)> Hey @sbenejam <https://github.com/sbenejam> we tested cross universe on a real installation and it does what it says. It crosses even a single pixel, while what you are asking is to preserve pixel layout across universes. Obviously it can be done, but is it still the concept of cross universe? @yestalgia <https://github.com/yestalgia> thoughts? — Reply to this email directly, view it on GitHub <#1694 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABO5H43O2AC3YXPNM3VOPH32TSCRRAVCNFSM6AAAAABYUO6JQKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMBZGAYDMNBZGY> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[yestalgia]

I agree that this needs to be an option. I've spoken to a few manufacturers about it and they've confirmed what @sbenejam has said.

[sbenejam]

Any news on this issue/improvement?. I think it can be a good improvement for everyone to be able to choose the cross-universe options when creating an RGB panel taking into account how the LED strip controller devices of many manufacturers behave.

[mcallegari]

I have started to work on it in this branch
https://github.com/mcallegari/qlcplus/tree/rgbpreserve

However, at the moment I have other priorities and this will have to wait

[sbenejam]

Don't worry Massimo, it usually works well right now. But it is an improvement that would make it much easier for users to create RGB panels.

[yestalgia]

Reported here as well