Color issues with Firefox

[András Beke]

Hello,

on a SLES 15 SP4, where the VNC server is tigervnc-1.10.1-150400.7.5.2 , the desktop is XFCE, and the client is TigerVNC v1.12.0 (64-bit), users experience color and/or graphics issues with Firefox 102.5.0(esr) (64-bit), which causes trouble for them to perform certain tasks within browser interfaces so they are somewhat frustrated.

One characteristic of the issue is that certain areas within Firefox window appear as if those were in CMYK, like Google logo, SuSE chameleon, facebook on the following:

Others look normal:

So far I could find out that the color issue may be improved with, but neither did resolve the whole issue.

1. Setting in Firefox image.downscale-during-decode.enabled to false. This may improve the look like the following from www.suse.com (left with set to true, right with false)

2. Disabling window compositor in XFCE, which causes the following difference (1st compositor enabled, 2nd disabled):

As it can be seen, the Firefox about window normally doesn't look like this.

Users sent screen shots of the following issues too.

Table header row and button colours:

White text on white background:

Table checkbox graphics issue:

I appreciate that this may not be the issue of TigerVNC but Firefox, however I wanted to ask here too as colour issues may be related to desktop graphics driver and I'm looking for any clues or idea about how this issue may be addressed.

Thank you in advance.

Andras

[Pierre Ossman]

On 28/12/2022 16:55, András Beke wrote:
>
> I appreciate that this may not be the issue of TigerVNC but Firefox,
> however I wanted to ask here too as colour issues may be related to desktop
> graphics driver and I'm looking for any clues or idea about how this issue
> may be addressed.
>

I'm afraid this looks like some rendering issue, rather than a VNC
issue. As such, it's difficult for us to help with this. :/

Could try if Xvnc from our builds works better?

Regards
--
Pierre Ossman Software Development
Cendio AB https://cendio.com
Teknikringen 8 https://twitter.com/ThinLinc
583 30 Linköping https://facebook.com/ThinLinc
Phone: +46-13-214600

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

[András Beke]

Thank you Pierre, I guess using the builds would need prerequisite / dependency update which seems to be rather complicated in this environment.

Looks like it's both simpler and aimed more correctly if we attempt to proceed with the investigation towards Firefox.

Andras

[Pierre Ossman]

On 29/12/2022 09:24, András Beke wrote:
> Thank you Pierre, I guess using the builds would need prerequisite /
> dependency update which seems to be rather complicated in this environment.
> Looks like it's both simpler and aimed more correctly if we attempt to
> proceed with the investigation towards Firefox.
>

The dependencies for the generic builds should be fairly low. Those are
the builds in the .tar.gz files. The RPMs are all for other systems than
SUSE.