Re: t-tikz: problem with colorspace pgfprgb

["Mojca Miklavec" <mojca.miklavec.lists@gmail.com>]

On Mon, Mar 3, 2008 at 6:15 AM, Aditya Mahajan wrote:
> On Sun, 2 Mar 2008, Finn Martensen wrote:
> > 2008/3/2, Aditya Mahajan <adityam@umich.edu>:
>  >
>  >> > I have the following problem with TikZ: When I use the "patterns"
>  >> > library in a tikzpicture environment, the file is compiled without
>  >> > problems and creates a PDF file. However, Acrobat displays an error
>  >> > message "Could not find the ColorSpace named 'pgfprgb'". [...]
>  >>
>  >> Can you please post a minimal example? I have compiled a few examples
>  >>  from the tikz manual by using all tikz librarries, but never had this
>  >>  problem.
>  >
>  > It just discovered that it depends, e.g., on whether there is only one
>  > page with a tikzpicture or more pages with tikzpictures. To give code
>  > examples: the first works, but not the second
>  >
>  > **************************************
>  > Code with no problems:
>  > **************************************
>  > \usemodule[tikz]
>  > \usetikzlibrary[patterns]
>  > \starttext
>  > \starttikzpicture
>  > \fill[pattern=dots] (0,0) -- (0,1) -- (1,1) -- (1,0);
>  > \stoptikzpicture
>  > \stoptext
>  >
>  > **************************************
>  > Code with problems:
>  > **************************************
>  > \usemodule[tikz]
>  > \usetikzlibrary[patterns]
>  > \starttext
>  > \starttikzpicture
>  > \draw (0,0) -- (1,0);
>  > \stoptikzpicture
>  > \page
>  > \starttikzpicture
>  > \fill[pattern=dots] (0,0) -- (0,1) -- (1,1) -- (1,0);
>  > \stoptikzpicture
>  > \stoptext
>
>  I can reproduce this problem. On linux, with evince pdf viewer (2.21.91) I
>  get "Error: Bad color space 'pgfprgb'", with Adobe reader (8.1.2) "Wrong
>  operand type".
>
>  The example does work fine with plain TeX and LaTeX. Something
>  wrong in the way patterns are handled by tikz for context. I do not think
>  that anyone on this list understands the internals of TikZ. Your best bet
>  is to report this to the tikz-mailing list.

Till Tantau has already replied (privately):

>  I tracked down this problem. It turns out that ConTeXt does, well,
>  radical things with the page resources (it simply resets them after
>  each page, which is why a pattern cannot be used on any page other
>  than the page on which it is defined). I'll try to fix this later,
>  although ConTeXt could be a bit less aggressive, here...

--------

>  I fixed this in the CVS. You will have to check it out to use the patch.
>
>  The main problem is that pgf and context both fight over who can set
>  page resources. As there is no clean way to do this, both pgf and
>  context have their own systems.
>
>  Actually, context's system is a bit cleaner, but we also have to
>  support latex and plain tex.
>
>  Anyway, I put in some patches that should solve the problem under
>  normal circumstances. If you use ConTeXt commands that also mess
>  around with extended graphic states, some further changes would
>  presumably be necessary, but I'm not sure.

So ... feel free to test it (should I set up automatic updates of tikz
from cvs for the minimals?).

Mojca
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