Difference between revisions of "Color"

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* For spot colors, say spot=yes. To eliminate everything except spot colours, leaving a clean file for professional printing, accompany this with rgb=no,cmyk=no. See spot colours below for more details.
 
* For spot colors, say spot=yes. To eliminate everything except spot colours, leaving a clean file for professional printing, accompany this with rgb=no,cmyk=no. See spot colours below for more details.
 
* Normally all colors are defined in RGB ''and'' CMYK and get converted if needed.
 
* Normally all colors are defined in RGB ''and'' CMYK and get converted if needed.
 
 
== Using predefined colors: {{cmd|setupcolor}} ==
 
 
Colors have identifiers, some of which are grouped in more or less
 
widely known sets. The primary example of these possibly are the
 
[http://www.w3.org/TR/2002/WD-css3-color-20020219/#x11-color named colors of the X Windowing System],
 
a set of RGB vectors.
 
With the growth of the WWW this list of definitions eventually achieved
 
the rank of the default ''Web colors''.
 
For convenience the X11 colors, along with a couple others, are
 
pre-defined in Context in the form of a loadable module.
 
 
''NB'': there are two sets representing the web colors:
 
<code>xwi</code> and <code>x11</code>. The main difference between them
 
is that the latter defines variations for many keywords.
 
For instance, instead of having only one color ''deepskyblue'' with
 
<code>xwi</code>, you get another four colors ''deepskyblue1'',
 
''deepskyblue2'' ''deepskyblue3'' and ''deepskyblue4'' with the
 
<code>x11</code> set.
 
(Another technical aspect is that the latter are specified using
 
hexadecimal RGB values whereas the former rely on decimal values.)
 
 
To use them and any of the others listed below, pass the respective
 
definition identifier to {{cmd|setupcolor}}:
 
 
<texcode>
 
\setupcolor[x11]
 
</texcode>
 
 
The macro {{cmd|showcolor}} pretty prints a the list of all named
 
colors in a definition set.
 
 
<context mode="mkiv" source="yes" text="yields several pages of this:">
 
\showcolor[rgb]
 
</context>
 
 
=== MkIV ===
 
 
The definitions reside in the files prefixed <code>colo-imp-</code>, to
 
separate them from the color functionality that is implemented in
 
<code>colo-xxx.mkiv</code>.
 
 
{|
 
! id !! source !! description
 
|-
 
| rgb || {{src|colo-imp-rgb.mkiv}} || some simple colors, loaded by default (with translations for the different interface languages!)
 
|-
 
| xwi || {{src|colo-imp-xwi.mkiv}}
 
| Xorg color keywords (WWW), defined in decimal RGB
 
|-
 
| x11 || {{src|colo-imp-x11.mkiv}}
 
| extended Xorg color keywords (WWW), defined in hex RGB
 
|-
 
| ema || {{src|colo-imp-ema.mkiv}} || Emacs colors
 
|-
 
| dem || {{src|colo-imp-dem.mkiv}}
 
| color groups and palets for different language interfaces
 
|}
 
 
=== MkII ===
 
 
You will find lists of predefined colors in the files
 
<tt>colo-xxx.mkii</tt>, load them with
 
{{cmd|setupcolor}}<tt>[xxx]</tt>.
 
{|
 
! id !! source !! description
 
|-
 
| rgb || {{src|colo-rgb.mkii}} || some simple colors, loaded by default (with translations for the different interface languages!)
 
|-
 
| x11 || {{src|colo-x11.mkii}} || Xorg-colors (hex)
 
|-
 
| xwi || {{src|colo-xwi.mkii}}  || Xorg-colors (decimal)
 
|-
 
| pra || {{src|colo-???.mkii|link=no}}
 
| PRAGMA ADE corporate design (not included in the distribution?)
 
|-
 
| ema || {{src|colo-ema.mkii}} || Emacs colors
 
|}
 
  
 
=== Alternatives ===
 
=== Alternatives ===

Revision as of 20:47, 15 June 2015

< Visuals | Graphics >

Enabling colors

In current versions (newer than 11.05.2009) of ConTeXt mkiv, colors are enabled by default.

In older versions, colors must be enabled using

   \setupcolors[state=start]

Defining Colors

Choosing a color model

  • RGB and CMYK are enabled by default. If you want only RGB or only CMYK color, use cmyk=no or rgb=no. Multitone colors see below.
  • For spot colors, say spot=yes. To eliminate everything except spot colours, leaving a clean file for professional printing, accompany this with rgb=no,cmyk=no. See spot colours below for more details.
  • Normally all colors are defined in RGB and CMYK and get converted if needed.

Alternatives

You can generate an alternative definition set based on the results of the xkcd color survey with the xcs-colors.lua script.

Defining colors: \definecolor

\definecolor[blablue][r=.1, g=.1, b=1, c=1, m=.1, y=0, k=0, s=.2] (definition for RGB, CMYK and Grey!). See also Command/definecolor.


\definecolor[blablue][r=.25, g=.1, b=1, c=1, m=.1, y=0, k=0, s=.2]

Here's some \color[blablue]{blue text} inbetween!

Colors with Hexadecimal Numbers

You can also use hexadecimal numers to specify colors. You need to load the hex color module first:

\setupcolor[hex]
\definecolor[salmon][h=AB5757]

Hey, \color[salmon]{look at that!}


Choosing a color scheme

There are three basic strategies to select color combinations for a particular design

  1. Create a color scheme by picking several colors found within the objects to be used (photographs, pictures, etc)
  2. Create colors derived from those found in the objects to be used
  3. Create a color scheme based on the message to convey / the psychological effects of color

See for additional help & reference:

  • colorschemedesigner.com - Useful site to help choose a color scheme in rgb color space
  • Tina Sutton, Bride M Whelan: The Complete Color Harmony. Rockport Publishers (2004). ISBN 978-1592530311 (recommanded in the mailing list)


Using Colors

  • Use the color name like [color=blablue] in some \setup... command.

With text

Typeset single text elements with \color[colorname]{nice blue text}:

Three \color[red]{cool} cats

Alternatively, typeset text elements with \colored[rgb values]{colored text} (suggested on NTG-ConTeXt: [1]):

Three \colored[r=.4, g=.4, b=.9]{colorful} kittens.


Typeset longer sections with \startcolor[colorname] ... \stopcolor:

\setuppapersize[A6]
\starttext
\startcolor[orange]
\input tufte
\stopcolor
\stoptext

In titles

See Titles#Using_colors_in_chapters_and_sections

With frames

\framed[background=color, backgroundcolor=green]{bla}
\framed[background=color, backgroundcolor=yellow, corner=00]{bla}

Background of the page

\setuppapersize[A10]
\setupbackgrounds[page][background=color,backgroundcolor=blue]

\starttext
text
\stoptext

Background of cells in tables

See

In Metapost

Metapost in MkIV is different from MkII and all labels are typeset and colored in TeX, if you want a label use

 label(textext("\blue RED"),origin) ;

In TikZ

\usemodule[tikz]
\starttext
\tikz\shade[ball color=red!40!yellow] (0,0) circle (.15cm);
\stoptext


References


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