Re: [libreoffice-design] Fwd: Color palette generator

Hi Tomaž,

Thank you very much for your answer

> You probably reinvented some transform color transform I guess.. but
> it is an interesting approach too.

Yes! Of course, nowadays I'm sure there is another way of doing the same or
even better! I just wanted to share that it's already quite easy to obtain
a fair result (the code may look quite long but I guess it's because I'm
using Fortran and programing as a chemical engineering). I shared it also
because it's already working: it generates a valid LibO color palette.

regards!

2016-09-27 18:52 GMT-03:00 Tomaž Vajngerl <quikee@gmail.com>:

> Hi,
>
> On Tue, Sep 27, 2016 at 10:24 PM, Francisco Adrián Sánchez
> <franciscoadriansanchez@gmail.com> wrote:
> > Dear design team,
> >
> > My name is Francisco Sánchez, I'm a chemical engineer who loves doing his
> > work with LibreOffice (even though I'm not always allowed to). Although
> I'm
> > not listed in the design team nor mailing list, I've already contributed
> > some times with a few opinions and even I've presented some Impress
> > templates for the 5.0 conquest.
> >
> > I've used OOs since 2009, and one thing that I had always missed from MS
> > Office was the ability to generate a color palette from some theme
> colors.
> > Since I'm a chemical engineer that knows Fortran (yes, Fortran) I decided
> > to code an app that were able to read some colors in RGB coordinates
> > generating then a LibreOffice color palette. Since these files are just
> > text files, I though they should be easy to produce using the only
> language
> > I know... Fortran.
> >
> > That said, first I analyzed the gradients that MS Office 2007 produces,
> and
> > correlated the resulting alteration of each coordinate for each gradient.
> > For example, if one base color has a red coordinate of 50, the "clear
> 90%"
> > shadows will have a red value which is a function of 50.
> > Pardon me if I don't know if there's an easier way to do this, it's just
> > what I could do it.
> >
> > Astonishingly, there is a correlation (a polynomial one). Based on the
> > coefficients I got, I coded the following app in Fortran. My app works
> > fairly ok, producing pretty similar results to the one that can be found
> in
> > MS Office.
> >
> > I don't want to type a will here, but if you are interested on it I can
> > email you a link to download the code and some instructions to compile.
> I'm
> > not leaving any link here because I fear that the antispam filter will
> > catch this email. Thus, I've uploaded the code inside an ODT file into
> the
> > Document Foundation Wiki. Thus, if you are interested please look for the
> > file:
> >
> > "File:Palette_Fortran_code.odt".
> >
> > There's an screenshot there also.
> >
> > Last, I'd like to make it clear that I'm not intending to say that you
> > should include this code in LibreOffice, nor that LibreOffice should
> > generate the same palettes than MSOffice does.
> >
> > However, I found my app quite useful for my proposes. Also, I know that
> > some of you are already dealing with document themes. So, I think that
> the
> > idea behind it could be useful for you also.
> >
> > That said, I wish you will have a nice weekend.
> >
> > Best regards,
> >
> > Francisco
>
> It would be easier to use HSL colorspace instead of RGB. RGB is ideal
> for monitors to produce a picture but not that good if you want to do
> color manipulation. If you convert a RGB color to HSL colorspace you
> have Hue - a 360 degree color value, Saturation of that color and
> Lightness - how dark or light it is represented. This color
> representation makes more sense and opens new possibilities. To get
> the complementary color you just rotate the hue for 180°, adjacent
> colors +-30°, desaturate a color, just lower the saturation...
>
> So to make a set of colors you can just select some fixed saturation
> and lightness values and then "rotate" the hue "wheel" and you get
> your first set, then repeat.
>
> What MS does with theme colors is tinting and shading, which is also
> performed in HSL colorspace. Tinting means mixing the selected color
> with white and shading is mixing with black (the value is in percent).
> This is how they generate their palette, what I'm not sure exactly is
> how they choose the mixing percentages.
>
> You probably reinvented some transform color transform I guess.. but
> it is an interesting approach too.
>
> Regards, Tomaž

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