Re: Bug with overprinting in Mark II/IV?

[luigi scarso <luigi.scarso@gmail.com>]

On Fri, Dec 11, 2009 at 1:53 PM, Oliver Heins <olli@sopos.org> wrote:
> Hello,
>
> with color black overprinting is not working.  You can easily spot this
> when you use the »Ausgabevorschau« (sorry, my acrobat is in german
> locale, must be something with »preview« in english; located in the
> »tools« menu) in acrobat and remove magenta and black from the preview.
> Whilst under the region with the magenta colored text the picture gets
> shown, in the region with the black colored text the text is cut out of
> the picture, leaving white.
>
> I think this is a bug, as overprinting makes most sense with black.  It
> happens both in Mark II and IV -- you have to manually copy the
> hacker.jpg to your working directory (under linux e.g. with cp
> $(kpsewhich hacker.jpg) /path/to/your/working/directory) and change the
> path to make the minimal example work under mark iv.
>
> Best regards,
>  olli
>
> \setupcolors[state=start,cmyk=yes,rgb=no]
>
> \definelayer    [mybg]
>                [x=0mm, y=0mm,
>                width=\paperwidth, height=\paperheight,
>                repeat=yes]
> \setlayer       [mybg]
>                [hoffset=5cm, voffset=7cm]
>                {\externalfigure[sample/hacker.jpg][max]} % mark ii
> %               {\externalfigure[hacker.jpg][max]} % mark iv
> \setupbackgrounds[page][background=mybg]
>
> \starttext
>
> {\bf With foregroundcolor = magenta.}
> \color[magenta]
>
> \startoverprint
> \input tufte
> \stopoverprint
>
> \color[black]
> {\bf With foregroundcolor = black. \color[magenta](Some magenta
>  without overprint)}
> \color[black]
>
> \startoverprint
> \input tufte
> \stopoverprint
>
> \stoptext
>
> --
hm I believed  was

\color[red]{......}

and
\startcolor[red]
...
\stopcolor

see
http://wiki.contextgarden.net/Colors

-- 
luigi
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