[Libreoffice-ux-advise] [Bug 80196] standardize color palette using mathematically generated colors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80196

--- Comment #19 from Owen Genat <owen.genat at gmail.com> ---
(In reply to comment #17)
> I think you're close.  It would work better if the grey scale tones between
> BLACK (0% grey) and WHITE (100% grey) were aligned with the color grey scale
> values.  If you choose the same values that were in my chart it would mean
> 12 rows and 13 columns (or, alternatively 13 rows and 12 columns if you do
> in the other direction).  My diagram uses twelve (12) color vectors plus
> grey, but you could go with 3, 6, 12, 24, 48, etc.

Thanks for clarifying the naming of the monochrome scale. It is not going to be
possible to change the layout of the colour picker from 12 to 13 columns, so we
are going to have to use a row-per-hue (rather than column-per-hue) layout for
this palette if all the scales are to run in the same direction. This is
actually simpler for palette creation as a hue > tone (rather than tone > hue)
order in XML entries makes more sense IMO. Most palettes tend to have a greater
number of hues than tones.

(In reply to comment #18)
> 2) There is a Wiki at: http://en.wikipedia.org/wiki/Color_bars

Here in Australia we use the PM5544 (PAL) test pattern:

http://en.wikipedia.org/wiki/Testcard

... in place of the NTSC one, which you indicate later under point (4).

> 3) An example is the EG 1:1990 “Alignment Color Bar Test Signal for
> Television Picture Monitors”. [...] Find “EG 1:1990” in the list; you should
> be able to download it at no cost. Note: this is an older analog TV standard
> that they now make available at no charge.

I can see the entry in the search list, but it does not appear to be free
(US$50.00 showing here). Standards that are not freely available make it more
difficult for others to implement. Many documents have author / publisher
copyright but are still made freely available. This applies to points (9) and
(12) also. A patent is a much more significant issue than copyright, although I
sincerely doubt a palette in different arrangement. 

> 10) Colors themselves are not offered copyright protection in the United
> States, or the rest of the world under the Berne convention.

LO can use generic colour names, e.g., "58% Magenta" or "Pinkish-purple 123".
Branded colour names are however only likely to be usable under license, e.g.,
"Pantone 630 C". This issue would not appear to affect this palette but IANAL.

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