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https://issues.apache.org/jira/browse/GUACAMOLE-470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16563961#comment-16563961
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Jim Chen commented on GUACAMOLE-470:
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Looks like we should add a call to `guac_terminal_find_color` when parsing the 
value. I'll try to get to the docs by the end of the week.

> Make individual terminal colors configurable through "color-scheme" parameter
> -----------------------------------------------------------------------------
>
>                 Key: GUACAMOLE-470
>                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-470
>             Project: Guacamole
>          Issue Type: Improvement
>          Components: Documentation, SSH, Telnet, Terminal
>            Reporter: Jim Chen
>            Priority: Major
>             Fix For: 1.0.0
>
>
> I'd be happy to work on this feature if the maintainers think it's a good 
> idea.
> Currently, the "color-scheme" parameter in the configuration xml can only 
> choose one of four color schemes. It would be nice if it can also configure 
> individual colors, so that more customized color schemes can be chosen.
> I propose to make the "color-scheme" parameter a series of semicolon 
> separated commands, e.g. "{{black-white; color2: rgb:cc/33/22; ...}}", where 
> each command specifies a color-set or a single color. This new format would 
> be backward-compatible with the previous format, because previous values like 
> "{{black-white}}" would be interpreted as a single command.
> Possible color-set commands are same as before: "{{black-white}}", 
> "{{gray-black}}", "{{green-black}}", and "{{white-black}}". These commands 
> set the foreground-background colors to existing values.
> The single-color commands are "{{foreground: <color>}}", "{{background: 
> <color>}}", and "{{color<n>: <color>}}", where {{<n>}} is a number from 0 to 
> 255, and {{<color>}} is a color value in the format {{rgb:RR/GG/BB}}, which 
> matches the format used by xterm. These commands set the specified color to 
> new values.



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