Useful routines for color space calculations

[Daniel Scott Matthews]

See http://www.ncl.ucar.edu/Document/Functions/color.shtml

The application above is open source so the code can be used for
reference and some of those functions would be useful in K-3D.

In particular the color space conversions RGB2HLS and HLS2RGB

With the color space conversions it is possible to have objects retain
colors that relate to each other while changing over time or in
relation to changes in some other property in the scene.

A GUI use would be to have the point, edge and face painters colors
hue shifted yet related so that you can see selections better. e.g.
Point is Red, edge is shifted toward Blue and Face toward Yellow, just
enough so that where you have a complex selection set you can still
see the edges and points amongst the faces.

e.g.
Edge.Color = HueShift(Point.Color, -50)
Face.Color = HueShift(Point.Color, 50)

A few other basic operators such as luminance darker/lighter,
Saturation duller/brighter would add to the Hue rotate cold/warm


There are routines for color relations, harmonies here
http://extensions.services.openoffice.org/project/colorpalettes

Color Harmony (Complement, Split Complement, Triad, Clash, Tetrad
Symmetric, Tetrad Double Complement, Tetrad Complement, Pentagon,
Analogous Variation, Analogous)

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[Daniel Scott Matthews]

On Sun, Oct 18, 2009 at 7:31 AM, Daniel Scott Matthews
<dsmatthews@...> wrote:

> See http://www.ncl.ucar.edu/Document/Functions/color.shtml
>
> The application above is open source so the code can be used for
> reference and some of those functions would be useful in K-3D.
>
> In particular the color space conversions RGB2HLS and HLS2RGB
>
> With the color space conversions it is possible to have objects retain
> colors that relate to each other while changing over time or in
> relation to changes in some other property in the scene.
>
> A GUI use would be to have the point, edge and face painters colors
> hue shifted yet related so that you can see selections better. e.g.
> Point is Red, edge is shifted toward Blue and Face toward Yellow, just
> enough so that where you have a complex selection set you can still
> see the edges and points amongst the faces.
>
> e.g.
> Edge.Color = HueShift(Point.Color, -50)
> Face.Color = HueShift(Point.Color, 50)
>
> A few other basic operators such as luminance darker/lighter,
> Saturation duller/brighter would add to the Hue rotate cold/warm
>
>
> There are routines for color relations, harmonies here
> http://extensions.services.openoffice.org/project/colorpalettes
>
> Color Harmony (Complement, Split Complement, Triad, Clash, Tetrad
> Symmetric, Tetrad Double Complement, Tetrad Complement, Pentagon,
> Analogous Variation, Analogous)
>

Correction the oo URL has pre-calulated color harmony sets, not code.
I will continue to look for the formulas.

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