[metapost] defaultcolormodel

[luigi scarso]

2011/7/8 Karel <akk64 at quick.cz>:
> Taco Hoekwater napsal(a):
>>
>> On 07/08/2011 12:01 AM, Stephan Hennig wrote:
>>>
>>> Hi,
>>>
>>> I'm wondering what the meaning of variable defaultcolormodel is.  The
>>> manual is rather terse (p.28):
>>>
>>>   The ‘current default’ color model can be set up using the internal
>>>   variable defaultcolormodel.  Table 2 lists the valid values.
>>>
>>> Well, variable defaultcolormodel determines the colour space of the
>>> black ink that is used for drawing and filling strokes, i.e., whether 0,
>>> (0,0,0) or (0,0,0,1) is written into the output.
>>
>> Yes.
>>
>
> I think it is not the case. I tried
>
> defaultcolormodel:=3;
>
> beginfig(0);
> defaultcolormodel:=3;
> draw fullcircle scaled 10mm withcolor .5white;
> endfig;
>
> and the resulting color in the output is in rgb!
> One has firstly redefine white and background as numeric... or write only
>
> withcolor.5;
hm. cmyk is the dual of rgb.
RGB off usually means black (ie. emissions are zero)
but cmyk off means "the color of the background" (i.e the light
reflected is 100% the light incident).



-- 
luigi