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List:       kde-panel-devel
Subject:    D11262: KDE logout screen background color fix
From:       Radek_Hušek <noreply () phabricator ! kde ! org>
Date:       2018-03-27 15:56:46
Message-ID: 20180327155646.1.3DAD26730521699B () phabricator ! kde ! org
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Pitel added a comment.


  I finally got to do some testing and it is not looking good for luminance formula \
`0.2126*r + 0.7152*g + 0.0722*b`.  
  Screenshot with background color `#5500FF` (blueish, button background on picture), \
you can see that black text is readable on it, but it has luminance only 0.14 so in \
overlay it is replaced by black.  F5769603: Screenshot_20180327_174715.png \
<https://phabricator.kde.org/F5769603>  
  So I would rather stay conservative, and used formula `max(r, g, b)`. I am still \
not sure whether the threshold should be `0.5` or a bit lower...

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D11262

To: Pitel, mart, #plasma
Cc: fredrik, ngraham, abetts, broulik, mvourlakos, plasma-devel, ragreen, ZrenBot, \
lesliezhai, ali-mohamed, jensreuterberg, sebas, apol, mart


[Attachment #3 (unknown)]

<table><tr><td style="">Pitel added a comment.
</td><a style="text-decoration: none; padding: 4px 8px; margin: 0 8px 8px; float: \
right; color: #464C5C; font-weight: bold; border-radius: 3px; background-color: \
#F7F7F9; background-image: linear-gradient(to bottom,#fff,#f1f0f1); display: \
inline-block; border: 1px solid rgba(71,87,120,.2);" \
href="https://phabricator.kde.org/D11262">View Revision</a></tr></table><br \
/><div><div><p>I finally got to do some testing and it is not looking good for \
luminance formula <tt style="background: #ebebeb; font-size: 13px;">0.2126*r + \
0.7152*g + 0.0722*b</tt>.</p>

<p>Screenshot with background color <tt style="background: #ebebeb; font-size: \
13px;">#5500FF</tt> (blueish, button background on picture), you can see that black \
text is readable on it, but it has luminance only 0.14 so in overlay it is replaced \
by black.<br /> <a href="https://phabricator.kde.org/F5769603" \
style="background-color: #e7e7e7;  border-color: #e7e7e7;
          border-radius: 3px;
          padding: 0 4px;
          font-weight: bold;
          color: black;text-decoration: none;">F5769603: \
Screenshot_20180327_174715.png</a></p>

<p>So I would rather stay conservative, and used formula <tt style="background: \
#ebebeb; font-size: 13px;">max(r, g, b)</tt>. I am still not sure whether the \
threshold should be <tt style="background: #ebebeb; font-size: 13px;">0.5</tt> or a \
bit lower...</p></div></div><br /><div><strong>REPOSITORY</strong><div><div>R120 \
Plasma Workspace</div></div></div><br /><div><strong>REVISION DETAIL</strong><div><a \
href="https://phabricator.kde.org/D11262">https://phabricator.kde.org/D11262</a></div></div><br \
/><div><strong>To: </strong>Pitel, mart, Plasma<br /><strong>Cc: </strong>fredrik, \
ngraham, abetts, broulik, mvourlakos, plasma-devel, ragreen, ZrenBot, lesliezhai, \
ali-mohamed, jensreuterberg, sebas, apol, mart<br /></div>



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