Re: Consistent Colors

[Wolfgang Schuster <wolfgang.schuster@gmail.com>]

Am 29.01.2013 um 09:11 schrieb Devendra Ghate <devendra.ghate@gmail.com>:

> I have been going through the concepts underlying pallet.
> 
> I would like to define three basic colors in RGB. Then use various shades
> and tints of these basic three colors through out the document.
> 
> Now the algorithm for getting various shades for RGB scheme is:
> 
> Darker shades:
> Multiply each component by 1/4, 1/2, 3/4, etc.
> of its previous value, depending on how dark the
> color should be.
> 
> Lighter tints:
> Calculate (1 - previous value), multiply that by
> 1/4, 1/2, 3/4, etc. and add that to the previous value.
> 
> What I would like is a macro that is fed a color name
> and should define 3 shades above and below it.

\definecolor[test-0][r=0.8,g=0.2,b=0.4]

\definecolor[test-1][1.00(test-0)]
\definecolor[test-2][0.75(test-0)]
\definecolor[test-3][0.50(test-0)]
\definecolor[test-4][0.25(test-0)]

\starttext
\startlines
\color[test-1]{1.00}
\color[test-2]{0.75}
\color[test-3]{0.50}
\color[test-4]{0.25}
\stoplines
\stoptext

Wolfgang
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