luigi.scarso at gmail.com
Fri Jul 8 12:58:17 CEST 2011
On Fri, Jul 8, 2011 at 12:31 PM, Stephan Hennig <mailing_list at arcor.de> wrote:
> There must be some colour to output anything even if no withcolor
> statement is given (including drawoptions).
yes, of course. Probably in the default format, or in metapost itself
there is a default color (0,0,0)
> Think about MetaFont that
> has no notion of colours, yet it has to distinguish between pixels that
> have been touched by a pen and those that haven't in the output. This
> 'implicit' black is what defaultcolormodel refers to (and what I meant
> by 'black ink').
In Metafont each pixel has 7 weights: -3,-2,-1,0,1,2,3, hence
it's a kind of gray color space.
It's useful to ensure that a pixel is black.
More information about the metapost