Re: overprinting

[Hans Hagen <pragma@wxs.nl>]

Peter Rolf wrote:
> Hans Hagen schrieb:
>> Peter Rolf wrote:
>>> Hans Hagen schrieb:
>>>> Peter Rolf wrote:
>>>>> Hi,
>>>>>
>>>>> overprinting is broken here. I used \dostartoverprint in the past, 
>>>>> but this no longer works. What is the recommended way for 
>>>>> overprinted text nowadays?
>>>>
>>>> just \startoverprint Overprint \stopoverprint
>>>>
>>> I see. A quick test shows, that this macro is not working with mkii 
>>> (an updated example is attached).
>>> Sadly this macro also does not work in my graphics, if I simply 
>>> exchange \dostartoverprint with \startoverprint (regardless of the 
>>> mark).
>>
>> you need to enable it with \setupcolors[overprint=yes]
>>
> I tried that one before, but it enables kind of global overprinting in 
> mkii (all but \startoverprinting, including the mp graphic). In case of 
> mkiv this breaks the \startoverprinting macro (so no overprinting at 
> all). I attached a new example.
> 
>> btw, your mkiv definitions do nothing (just toggle some flag) and the 
>> \dodriverthing's are gone anyway
>>
> Ok, then I must find a new working overprinting macro for my texts.

\setupcolors[overprint=yes]

\ifnum\contextmarkmode=4
\def\dostartoverprint%
   {\ctxlua{overprints.enabled=true}}
\def\dostopoverprint%
   {\ctxlua{overprints.enabled=false}}
\fi

this really does nothing, apart from enableng backend processing of set 
overprints

\starttext

\startMPcode
    fill unitcircle scaled 5cm;
\stopMPcode

\starttextoverprint starttextoverprint \stoptextoverprint % fails in 
both marks
\dostartoverprint dostartoverprint \dostopoverprint % fails in mkiv only
\startoverprint overprint \stopoverprint % fails in mkii only

\stoptext

well, in order to figure out the problem i need a better test file (at 
least one that shows the effect you want to achieve) as i have none here

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                                           Hans Hagen | PRAGMA ADE
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