[pdftex] Two-color printing with pdftex

Christopher Adams chris at raysend.com
Sun Nov 21 10:13:09 CET 2010

Any working code samples for this kind of thing? Very alluring concept.

On Sun, Nov 21, 2010 at 12:14 AM, Taco Hoekwater <taco at elvenkind.com> wrote:

> On 11/20/2010 04:02 PM, Jeffrey McArthur wrote:
>> The way I did color separation in the past was moderately complicated. I
>> used some font tricks with virtual fonts.
>> I used tfmtopl to create the .PL file for each font.
>> Then I hacked the .PL file into a VPL file.
>> If I wanted the text for that font/color combination to print, then it set
>> the char, otherwise it just did a move.
>> Then you switch the virutal fonts to print in one color or the other.
>> Rules are managed the same way by setting the rule in the VPL file and not
>> in TeX.
>> Graphics are done by using a special command in the VPL file.
>> This is very ugly, but it worked.
> I think this is pretty good way of doing it (I used a similar approach
> a few years ago), but it can get rather complex in documents with lots
> of fonts.
> These days, I usually create a composite pdf that uses only the C and
> K parts of CMYK, and I expect the printer to be able to handle that
> (either by splitting the pdf into the two composites in preprocessing,
> or by telling the device driver of the press that C is the secondary
> color and that MY can be ignored). If the printer claims he cannot do
> that, I search the yellow pages for a better printing house.
> Best wishes,
> Taco
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