[Libreoffice-ux-advise] [Bug 104052] Add LibreColour HLC palette

https://bugs.documentfoundation.org/show_bug.cgi?id=104052

--- Comment #55 from Christoph Schäfer <christoph-schaefer@gmx.de> ---
(In reply to Taylor Jenkins from comment #54)
> Created attachment 129558 [details]
> Comparison between hlcfaecher.pdf & LO Writer w/ librecolour.soc
>
> This is a screenshot with the hlcfaecher.pdf color swatch on the left, the
> corresponding color in LO from librecolour.soc in the the middle, and the
> color in LO using the hex value shown in the pdf, on the right. When the two
> different hex values are shown side by side in LO, they are not noticeably
> different on my monitor. Curious why the pdf was noticeably different, I
> used a color picker to determine the actual color value, which is shown
> overlaid on the pdf color swatch.

Colour pickers aren't reliable. 

We are aware of minor differences between the sRGB/Hex values in the fans and
the SOC files. That's a problem of the algorithms and colour management systems
used for the conversion from CIELAB to sRGB. The colour fans have been produced
with Photoshop on Windows, hence the values according to Adobe's native CMS.
The converter we used to create the SOC files, however, was using littleCMS2,
which is much more precise than Adobe's outdated CMS.

In practice it doesn't matter much, though, because in RGB values, the
deviation isn't huge, one or two digits in one or two channels at most, which
is within the acceptable error margin, given the diversity of devices or output
targets.

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