[Libreoffice-ux-advise] [Bug 156182] FORMATTING Automatic text color can be unreadable with darker cell colors

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=156182

Heiko Tietze <heiko.tietze at documentfoundation.org> changed:

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                 CC|                            |libreoffice-ux-advise at lists
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--- Comment #2 from Heiko Tietze <heiko.tietze at documentfoundation.org> ---
Most if not all automatic colors are set by checking whether the background is
dark. It is implemented in include/tools/color.hxx as 

bool IsDark() const
{
//  62 is the number that means it also triggers on Ubuntu in dark mode
    return GetLuminance() <= 62;
}

bool IsBright() const
{
    return GetLuminance() >= 245;
}

And luminance is sal_uInt8((B * 29UL + G * 151UL + R * 76UL) >> 8);

I wonder how this luminance value relates to your calculation, that apparently
is much better dealing with the contrast.

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