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

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

--- Comment #15 from Christoph Schäfer <christoph-schaefer@gmx.de> ---
(In reply to V Stuart Foote from comment #1)
> Spent some time in Scribus 1.5.2 and downloaded and installed the OCSC CIE
> HLC palette (via Windows -> Resources -> Palettes category). Not so sure
> this should be a palette to adopt as a replacement LibreOffice standard.soc
> in whole. 
>
> Yes it has application for reproducible color management for desktop
> publishing support, but the HLC colors are rather muted--and the palette
> lacks handling  of the primary colors. Folks will find it too muted and not
> the best sRGB color space coverage.
>
> Still it would be a useful palette to bundle, and perhaps provide some
> mechanism for import of the OCSC libary of palettes to LibreOffice.
>
> Some technical issues on using the CIE HLC in LibreOffice.
>
> As noted, would need to resolve how to label each color swatch to show in
> its tool-tip popup. Any freieFarbe / freeColour naming in Deutsch would have
> to be translated--or maybe better drop any color names and depend on the
> swatch viewer alone (similar is done now for a few of the palettes--where
> for some reason naming for cmyk uses CMY, and gallery uses CMYK) -- but
> which sRGB (decimal or HEX) or CMYK (decimal)?
>
> And, if moving forward with an HLC based model, it is appropriate/necessary
> to rethink grid layout for the swatch display. 
>
> Currently we use 12 columns--chosen to hold black, white and our 10
> increments of gray1 - gray10. Something like the HLC tables organized by Hue
> 000 -> 360 into 36 tables, would need to go into a 9 column layout, with
> divider between the Hues--and the table would need to describe swatch blanks
> for colors outside the sRGB color space.
>
> Download Owen G.'s tonal_row.soc (attachment 105128 [details] from bug
> 80196) to $ORIGIN/share/palette and you can see challenge of the swatch view
> being fixed number of columns.
>
> Also, since each swatch from a palette will be shown on opening the color
> picker, the color picker widget currently has no support for an HLC CIE LAB
> color reference. Rather, like Scribus, we provide only an HSV (i.e. our HSB
> panel) based color cylinder representation drawn from sRGB values in the
> .soc palette. Can conversions showing HLC field be added? 
>
>
> =-ref-=
> https://en.wikipedia.org/wiki/HSL_and_HSV
>
> https://en.wikipedia.org/wiki/HCL_color_space
>
> http://cscheid.github.io/lux/demos/hcl/hcl.html

The HLC colours are "muted" for a reason: They can be replicated in CMYK, so if
you are working in a cross-media workflow (web and print) and need a maximum of
colour correctnes without resorting to spot colours, this is what you want.

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