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https://issues.apache.org/jira/browse/GUACAMOLE-1467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17450170#comment-17450170
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Nick Couchman commented on GUACAMOLE-1467:
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Just another note - if you look at the Windows GPO settings for color depth, it
says the following:
{quote}
Note:
1. Setting the color depth to 24 bits is only supported on Windows Server
2003 and Windows XP Professional.
2. The value specified in this policy setting is not applied to
connections from client computers that are using at least Remote Desktop
Protocol 8.0 (computers running at least Windows 8 or Windows Server 2012). The
32-bit color depth format is always used for these connections.
3. For connections from client computers that are using Remote Desktop
Protocol 7.1 or earlier versions that are connecting to computers running at
least Windows 8 or Windows Server 2012, the minimum of the following values is
used as the color depth format:
a. Value specified by this policy setting
b. Maximum color depth supported by the client
c. Value requested by the client
If the client does not support at least 16 bits, the connection is terminated.
{quote}
This indicates to me that:
* 24-bit is only supported on really old versions of Windows (2003 and XP)
* 32-bit is the only supported setting for anything recent-ish (8/2012+)
* Anything prior to 8/2012 is configurable (so 16, 8, etc - just not 24).
So, I'm not sure what's going on with your connection settings and guacd, but,
provided you're connecting to Windows 8 or later and Server 2012 or later, you
should get 32-bit color by default.
> Can RDP connections support 32 color-depth
> ------------------------------------------
>
> Key: GUACAMOLE-1467
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1467
> Project: Guacamole
> Issue Type: Improvement
> Components: guacamole-server, RDP
> Affects Versions: 1.3.0
> Reporter: will
> Priority: Major
> Attachments: guac-rdp-color-depth-32bit-option.png,
> image-2021-11-29-00-54-18-336.png, image-2021-11-29-01-09-06-018.png,
> image-2021-11-29-01-11-10-497.png, image-2021-11-29-01-12-11-098.png,
> image-2021-11-29-01-12-46-508.png, image-2021-11-29-01-13-36-417.png,
> image-2021-11-29-01-14-09-889.png
>
>
> Hello, guacamole is really a great project that provide us with great
> convenience.
> Recently, l use a software that only support 32 color-depth, but our
> guacamole don't support 32 color-depth when use rdp.
> Can RDP connections support 32 color-depth in future version?
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