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https://issues.apache.org/jira/browse/LOG4J2-3537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17554469#comment-17554469
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Piotr Karwasz commented on LOG4J2-3537:
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[~Pavel_K],
I agree that "bright blue" should be "bold blue", but we need to be concerned
with backward compatibility: users that use "bright blue" or "blue bright"
should not see any difference. So you can:
# add a semantically correct {{BOLD("1")}} constant,
# deprecate the {{BRIGHT}} constant and change its Javadoc to mark the fact
that it changes the font weight, not color brightness/saturation,
# correct the color table in the documentation to show the correct constants
you should use.
I think that LOG4J2-3538 is independent from this issue: you can add
{{BRIGHT_*}} (and {{FG_BRIGHT_*}} and {{{}BG_BRIGHT_*{}}}) constants to solve
this issue and independently add support for {{{}#RRGGBB{}}}, {{FG_#RRGGBB}}
and {{BG_#RRGGBB}} color specifications.
> Ansi escape code for highlight is generated wrong
> -------------------------------------------------
>
> Key: LOG4J2-3537
> URL: https://issues.apache.org/jira/browse/LOG4J2-3537
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.14.1
> Reporter: Pavel_K
> Assignee: Piotr Karwasz
> Priority: Minor
> Attachments: Screenshot from 2022-06-14 16-09-30.png, Screenshot from
> 2022-06-14 16-13-13.png
>
>
> This is a test pattern layout:
> {code:java}
> <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS}
> %highlight{[%level]}{FATAL=red bright, ERROR=red bright, WARN=yellow bright,
> INFO=magenta bright, DEBUG=green, TRACE=blue bright} [%t] %logger{36} -
> %msg%n" disableAnsi="false"/>
> {code}
> As you see for TRACE level is `blue bright`. However, this is a generated
> code:
> [34;1m[TRACE][m . As you see we have
> [SGR|https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters]
> function with two parameters: 34 is color and 1 is bold.
> For example linux terminal will render it this way:
> !Screenshot from 2022-06-14 16-09-30.png!
> We see, that it is not `bright blue` but `bold blue`. At the same time in
> [manual|https://logging.apache.org/log4j/2.x/manual/layouts.html] they speak
> about different colors:
> !Screenshot from 2022-06-14 16-13-13.png!
> And if we want bright blue, generated escape code should be `[94m[TRACE][m`
> - see the link to SGR function I provided.
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