How to make gray-colored text in ConTeXt beta?

Question

As I know, in ConTeXt stable, one can use \color[gray:3]{} to display the text inside the brackets with a very light gray color, e.g.:

\setupcolor[rgb]
\starttext
    \color[gray:3]{This is some text.}
\stoptext

After upgrading to ConTeXt beta, this no longer works in my document. \color[red]{}, however, does change the text to red.

Was the syntax for creating gray colors changed in recent betas?
How can I create a range of gray colors (from white to black) using numbers in ConTeXt?

I have ConTeXt version 2012.08.14. I followed the instructions here: wiki.contextgarden.net/Colors#Choosing_a_color_model
What about defining the colour with \definecolor[gray:3][s=.8]? You can also have a look at \definepalet
I can confirm this behavior. Seems to be a regression bug. Please report this to the context mailing list.
Bug aside, you can iterate through the X11 color definitions to achieve the grayscale gradient: \setupcolor [x11] \dostepwiserecurse{100}{0}{-1}{\color[gray\recurselevel]{foo\space}}. The value determines the percentage of white.

Aditya · Accepted Answer · 2012-10-22 14:44:50Z

Based on the solution of Philipp Gesang of the context mailing list:

Use \setupcolor[dem] to get scaled colors.

\setupcolor[dem]

\starttext
  \framed[background=color, backgroundcolor=gray:3]{testing}
\stoptext

(I am using background color so that the result is easier to visualize).

1 Answer