[metapost] background and non-rgbcolors

[Hans Hagen]

Stephan Hennig wrote:
> Hi,
>
> the internal variable background seems only to accept rgbcolor values
> (which is not documented).  Would it be possible to make 'background'
> accept cmykcolor or greyscale values as well?
>   
background is not really supported (contrary to mf)
> Another option were to introduce a new macro 'setUnfillColor' that
> accepts different colour types and is evaluated by 'unfill'.  For
> compatibility 'background' should take precedence over 'setUnfillColor',
> by default.  As soon as 'setUnfillColor' has been called with a valid
> colour it should overrule 'background'.  Calling 'unfillcolor' with a
> special value (e.g., any string value) should return 'unfill' to
> compatibility behaviour, i.e., evaluate variable 'background' only.
>   
afaik something unfill is on the agenda but more like the postscript 
feature (i.e. eofill

Hans


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