mailing_list at arcor.de
Fri Jul 8 16:32:58 CEST 2011
schrieb luigi scarso:
> On Fri, Jul 8, 2011 at 12:31 PM, Stephan Hennig <mailing_list at arcor.de> wrote:
> yes, of course. Probably in the default format, or in metapost itself
> there is a default color (0,0,0)
In the engine, AFAIK. And there are (0,0,0,1) for the CMYK model and 0
for the grey scale model, too.
>> 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.
Thanks for pointing this out. I'm not a regular MetaFont user, but I do
know that MetaFont doesn't have a 'withcolor' primitive. Do I figure
correctly, that the weights indicate to what extend the area of a pixel
has been covered by the pen?
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