[texhax] [TexHax] Black/white colour PDF

[Pierre MacKay]

On 05/29/2010 02:56 PM, Heiko Oberdiek wrote:
> On Thu, May 27, 2010 at 04:57:07PM +0200, Jean-Baptiste Valsamis wrote:
>
>    
>> When I printed my PHD, the printer was supposed to check if the pages
>> contains colour or not. After that, the printer counted 240 pages in coluor
>> and 10 pages in black/white.
>>      
> One question is, what is black for the printer?
> A test file:
>
> \pdfoutput=1
> \catcode`\{=1
> \catcode`\}=2
> \catcode`\#=6
> \count0=1
> \def\test#1{%
>    \shipout\hbox{%
>      \pdfliteral{#1}%
>      \vrule width 10mm height 10mm\relax
>    }%
>    \advance\count0 by 1\relax
> }
> \test{}
> \test{0 g}
> \test{0 0 0 rg}
> \test{0 0 0 1 k}
> \test{1 1 1 0 k}
> \def\test#1{%
>    \shipout\hbox{%
>      \pdfliteral{#1}%
>      \vrule width 40mm height .4pt\relax
>    }%
>    \advance\count0 by 1\relax
> }
> \test{}
> \test{0 G}
> \test{0 0 0 RG}
> \test{0 0 0 1 K}
> \test{1 1 1 0 K}
> \csname @@end\endcsname\end
>
> Run it through pdftex ("pdftex -ini", "pdftex", "pdflatex")
> and check the pages through your printer, which ones are "black/white",
> which are considered "colored"?
>
> Yours sincerely
>    Heiko Oberdiek
>    
I wonder if you need also to make sure that your color mode is CMYK and 
not RGB. It can be hard to specify black in RGB.

Pierre MacKay