# Difference between revisions of "Command/definecolorgroup"

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# \definecolorgroup

## Syntax

 \definecolorgroup[...][...][x:y:z=,...] [...] name [...] rgb cmyk gray s [x:y:z=,...]

## Description

\definecolorgroup[myblue][rgb][0:0:1,0:0;0.6,0:0:3] defines three colours `myblue:1`, `myblue:2`, `myblue:3`. If one defines similar gamuts for e.g. green and red, such that equal numbers correspond to equal grayscales, one can easily pick a red, a green, and a blue so that the colours still differ from each other when converted to grayscale.

ConTeXt has predefined colorgroups for red, green, blue, cyan, magenta, yellow, and gray; these are defined in colo-rgb.mkii for MkII, and colo-imp-dem.mkiv ('dem' for 'demo')for MkIV, and may be imported with \usecolors.

## Example

```% mode=mkiv
\usecolors[dem] % use predefined demo colors

% NB: The grayshades of this colorgroup are not calibrated
% to the ones in colo-imp-dem.mkiv
\definecolorgroup
[orange]
[1.00:0.85:0.80,
1.00:0.80:0.30,
0.80:0.50:0.00]

\definepalet[mypalet]
[myorange=orange:2,
myred=red:4,
myblue=blue:6,
mygreen=green:8]

\showcolorgroup[orange]

\comparepalet[mypalet]
```

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