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

[bugzilla-daemon at bugs.documentfoundation.org]

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

V Stuart Foote <vstuart.foote at utsa.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vstuart.foote at utsa.edu
            Summary|Add LibreColor palette      |Add LibreColour HLC palette

--- Comment #1 from V Stuart Foote <vstuart.foote at utsa.edu> ---
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 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

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