Different colors in LaTeX and ConTeXt

Different colors in LaTeX and ConTeXt

[Henri Menke]

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Dear list,

I wanted to draw some nice pictures using TikZ and pgfplots, but then I
noticed that the colors of the ticks in my pgfplots graph were unusually
bright and it looked very weird.   So I set up a test

> \usemodule[tikz]
> \starttext
> \starttikzpicture
>   \draw[help lines,very thick] (0,0) -- (1,0);
> \stoptikzpicture
> 
> \externalfigure[test-crop]
> \stoptext

where I produced test-crop.pdf from the following plain TeX sample,
which I also typeset with LuaTeX 0.95 (to make sure it's not a LuaTeX
regression).

> \input luatex85.sty
> \input tikz
> \tikzpicture
>   \draw[help lines,very thick] (0,0) -- (1,0);
> \endtikzpicture
> \bye

Attached you find the output of the ConTeXt example and you can see that
the color of the upper line (the one produced with TikZ inside ConTeXt)
has a much brighter color than the one produced with plain TeX.

I'm using ConTeXt MkIV distributed with TL 2016.

How can I adjust the colors in ConTeXt to match the ones produced by
plain TeX?  I need the adjustment in that direction, because I also have
old images produced with plain TeX/LaTeX that I'd like to seamlessly
integrate in my ConTeXt documents.

Cheers,
Henri

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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Hans Hagen]

On 7/12/2016 1:53 PM, Henri Menke wrote:
> Dear list,
>
> I wanted to draw some nice pictures using TikZ and pgfplots, but then I
> noticed that the colors of the ticks in my pgfplots graph were unusually
> bright and it looked very weird.   So I set up a test
>
>> \usemodule[tikz]
>> \starttext
>> \starttikzpicture
>>   \draw[help lines,very thick] (0,0) -- (1,0);
>> \stoptikzpicture
>>
>> \externalfigure[test-crop]
>> \stoptext
>
> where I produced test-crop.pdf from the following plain TeX sample,
> which I also typeset with LuaTeX 0.95 (to make sure it's not a LuaTeX
> regression).
>
>> \input luatex85.sty
>> \input tikz
>> \tikzpicture
>>   \draw[help lines,very thick] (0,0) -- (1,0);
>> \endtikzpicture
>> \bye
>
> Attached you find the output of the ConTeXt example and you can see that
> the color of the upper line (the one produced with TikZ inside ConTeXt)
> has a much brighter color than the one produced with plain TeX.
>
> I'm using ConTeXt MkIV distributed with TL 2016.
>
> How can I adjust the colors in ConTeXt to match the ones produced by
> plain TeX?  I need the adjustment in that direction, because I also have
> old images produced with plain TeX/LaTeX that I'd like to seamlessly
> integrate in my ConTeXt documents.

you need to figure out the default definitions in tikz then (i suppose 
'help lines' is related to some color)


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Henri Menke]

Dear Hans,

thanks for your reply.  Indeed there are color definitions in
`pgfutil-context.def`.  However, they are commented out with the message

> % no need for x colors (users can load it if needed)
> ...
> %\pgfutil@definecolor{gray}{gray}{0.5}

If I add

> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}

to my document the gray shows up fine.  So that's for sure a feasible
workaround.

Can you comment on the phrase »no need for x colors (users can load it
if needed)«?  I'm not quite sure what it means and it suggests that
there exists a proper solution to my color problem.

Cheers,
Henri

On 07/12/2016 02:29 PM, Hans Hagen wrote:
> On 7/12/2016 1:53 PM, Henri Menke wrote:
>> Dear list,
>>
>> I wanted to draw some nice pictures using TikZ and pgfplots, but then I
>> noticed that the colors of the ticks in my pgfplots graph were unusually
>> bright and it looked very weird.   So I set up a test
>>
>>> \usemodule[tikz]
>>> \starttext
>>> \starttikzpicture
>>>   \draw[help lines,very thick] (0,0) -- (1,0);
>>> \stoptikzpicture
>>>
>>> \externalfigure[test-crop]
>>> \stoptext
>>
>> where I produced test-crop.pdf from the following plain TeX sample,
>> which I also typeset with LuaTeX 0.95 (to make sure it's not a LuaTeX
>> regression).
>>
>>> \input luatex85.sty
>>> \input tikz
>>> \tikzpicture
>>>   \draw[help lines,very thick] (0,0) -- (1,0);
>>> \endtikzpicture
>>> \bye
>>
>> Attached you find the output of the ConTeXt example and you can see that
>> the color of the upper line (the one produced with TikZ inside ConTeXt)
>> has a much brighter color than the one produced with plain TeX.
>>
>> I'm using ConTeXt MkIV distributed with TL 2016.
>>
>> How can I adjust the colors in ConTeXt to match the ones produced by
>> plain TeX?  I need the adjustment in that direction, because I also have
>> old images produced with plain TeX/LaTeX that I'd like to seamlessly
>> integrate in my ConTeXt documents.
> 
> you need to figure out the default definitions in tikz then (i suppose
> 'help lines' is related to some color)
> 
> 
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> 
> If your question is of interest to others as well, please add an entry
> to the Wiki!
> 
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Hans Hagen]

On 7/12/2016 3:44 PM, Henri Menke wrote:
> Dear Hans,
>
> thanks for your reply.  Indeed there are color definitions in
> `pgfutil-context.def`.  However, they are commented out with the message
>
>> % no need for x colors (users can load it if needed)
>> ...
>> %\pgfutil@definecolor{gray}{gray}{0.5}
>
> If I add
>
>> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}
>
> to my document the gray shows up fine.  So that's for sure a feasible
> workaround.
>
> Can you comment on the phrase »no need for x colors (users can load it
> if needed)«?  I'm not quite sure what it means and it suggests that
> there exists a proper solution to my color problem.

normally you want the same colors in tikz images as in context so then 
defining them in tikz is creating incompatibilities (your case is the 
reverse and a-typical)

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Aditya Mahajan]

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On Tue, 12 Jul 2016, Hans Hagen wrote:

> On 7/12/2016 3:44 PM, Henri Menke wrote:
>> Dear Hans,
>>
>> thanks for your reply.  Indeed there are color definitions in
>> `pgfutil-context.def`.  However, they are commented out with the message
>>
>>> % no need for x colors (users can load it if needed)
>>> ...
>>> %\pgfutil@definecolor{gray}{gray}{0.5}
>>
>> If I add
>>
>>> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}
>>
>> to my document the gray shows up fine.  So that's for sure a feasible
>> workaround.
>>
>> Can you comment on the phrase »no need for x colors (users can load it
>> if needed)«?  I'm not quite sure what it means and it suggests that
>> there exists a proper solution to my color problem.
>
> normally you want the same colors in tikz images as in context so then 
> defining them in tikz is creating incompatibilities (your case is the 
> reverse and a-typical)

However, without such redefinitions, tikz does not understand ConTeXt 
colors. I use a similar workaround in my documents as well.

Perhaps, one could define a macro `\enabletikzcolors[...list..]` that will 
do the appropriate translations.

Aditya

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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Hans Hagen]

On 7/12/2016 5:07 PM, Aditya Mahajan wrote:
> On Tue, 12 Jul 2016, Hans Hagen wrote:
>
>> On 7/12/2016 3:44 PM, Henri Menke wrote:
>>> Dear Hans,
>>>
>>> thanks for your reply.  Indeed there are color definitions in
>>> `pgfutil-context.def`.  However, they are commented out with the message
>>>
>>>> % no need for x colors (users can load it if needed)
>>>> ...
>>>> %\pgfutil@definecolor{gray}{gray}{0.5}
>>>
>>> If I add
>>>
>>>> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}
>>>
>>> to my document the gray shows up fine.  So that's for sure a feasible
>>> workaround.
>>>
>>> Can you comment on the phrase »no need for x colors (users can load it
>>> if needed)«?  I'm not quite sure what it means and it suggests that
>>> there exists a proper solution to my color problem.
>>
>> normally you want the same colors in tikz images as in context so then
>> defining them in tikz is creating incompatibilities (your case is the
>> reverse and a-typical)
>
> However, without such redefinitions, tikz does not understand ConTeXt
> colors. I use a similar workaround in my documents as well.

I have no clue what you mean.

\definecolor[red][g=1]

\startTEXpage
     \starttikzpicture
        \fill[red] (0,0) circle (1cm);
     \stoptikzpicture
\stopTEXpage

works ok here and gives green. So, one can collect a list of colors 
defined in tikz in a colo-imp-tikz.mkiv and load that one if needed.

> Perhaps, one could define a macro `\enabletikzcolors[...list..]` that
> will do the appropriate translations.

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Aditya Mahajan]

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On Tue, 12 Jul 2016, Hans Hagen wrote:

> On 7/12/2016 5:07 PM, Aditya Mahajan wrote:
>> On Tue, 12 Jul 2016, Hans Hagen wrote:
>>
>>> On 7/12/2016 3:44 PM, Henri Menke wrote:
>>>> Dear Hans,
>>>>
>>>> thanks for your reply.  Indeed there are color definitions in
>>>> `pgfutil-context.def`.  However, they are commented out with the 
> message
>>>>
>>>>> % no need for x colors (users can load it if needed)
>>>>> ...
>>>>> %\pgfutil@definecolor{gray}{gray}{0.5}
>>>>
>>>> If I add
>>>>
>>>>> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}
>>>>
>>>> to my document the gray shows up fine.  So that's for sure a feasible
>>>> workaround.
>>>>
>>>> Can you comment on the phrase »no need for x colors (users can load it
>>>> if needed)«?  I'm not quite sure what it means and it suggests that
>>>> there exists a proper solution to my color problem.
>>>
>>> normally you want the same colors in tikz images as in context so then
>>> defining them in tikz is creating incompatibilities (your case is the
>>> reverse and a-typical)
>>
>> However, without such redefinitions, tikz does not understand ConTeXt
>> colors. I use a similar workaround in my documents as well.
>
> I have no clue what you mean.
>
> \definecolor[red][g=1]
>
> \startTEXpage
>     \starttikzpicture
>        \fill[red] (0,0) circle (1cm);
>     \stoptikzpicture
> \stopTEXpage
>
> works ok here and gives green. So, one can collect a list of colors 
> defined in tikz in a colo-imp-tikz.mkiv and load that one if needed.

I guess it is a bug with pgfplots rather than tikz (which also means that 
it may be easier to pursuade pgfplot maintainers to use low level tikz 
interface, since tikz is already playing nice with context).

\usemodule[tikz,pgfplots]
\definecolor[red][g=1]

\startmode[bug]
\unprotect
\pgfutil@definecolor{red}   {rgb} {0,1,0}
\protect
\stopmode

\starttext
\startTEXpage
      \starttikzpicture
        \startaxis
          \addplot[color=red] coordinates { (0,0) (1,1) };
        \stopaxis
      \stoptikzpicture
\stopTEXpage
\stoptext

Aditya

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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Henri Menke]

Dear Aditya and Hans,

I'm not so sure about it being a bug in pgfplots.  I played a little and
encountered the following.

> \usemodule[tikz]
> \starttext
> 
> % Original gray
> \blackrule[color=gray,width=1cm,height=1pt]
> 
> \starttikzpicture
>   \draw[gray,line width=1pt] (0,0) -- (1,0);
> \stoptikzpicture
> 
> % New colors
> \definecolor[gray][s=0.5]
> \unprotect
> \pgfutil@definecolor{tikzgray}{gray}{0.5}
> \protect
> 
> % Now ConTeXt's gray = tikzgray
> \blackrule[color=gray,width=1cm,height=1pt]
> 
> \starttikzpicture
>   \draw[tikzgray,line width=1pt] (0,0) -- (1,0);
> \stoptikzpicture
> 
> % Inside TikZ gray is still off
> \starttikzpicture
>   \draw[gray,line width=1pt] (0,0) -- (1,0);
> \stoptikzpicture
> 
> \stoptext

Cheers,
Henri

On 07/12/2016 08:23 PM, Aditya Mahajan wrote:
> On Tue, 12 Jul 2016, Hans Hagen wrote:
> 
>> On 7/12/2016 5:07 PM, Aditya Mahajan wrote:
>>> On Tue, 12 Jul 2016, Hans Hagen wrote:
>>>
>>>> On 7/12/2016 3:44 PM, Henri Menke wrote:
>>>>> Dear Hans,
>>>>>
>>>>> thanks for your reply.  Indeed there are color definitions in
>>>>> `pgfutil-context.def`.  However, they are commented out with the 
>> message
>>>>>
>>>>>> % no need for x colors (users can load it if needed)
>>>>>> ...
>>>>>> %\pgfutil@definecolor{gray}{gray}{0.5}
>>>>>
>>>>> If I add
>>>>>
>>>>>> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}
>>>>>
>>>>> to my document the gray shows up fine.  So that's for sure a feasible
>>>>> workaround.
>>>>>
>>>>> Can you comment on the phrase »no need for x colors (users can load it
>>>>> if needed)«?  I'm not quite sure what it means and it suggests that
>>>>> there exists a proper solution to my color problem.
>>>>
>>>> normally you want the same colors in tikz images as in context so then
>>>> defining them in tikz is creating incompatibilities (your case is the
>>>> reverse and a-typical)
>>>
>>> However, without such redefinitions, tikz does not understand ConTeXt
>>> colors. I use a similar workaround in my documents as well.
>>
>> I have no clue what you mean.
>>
>> \definecolor[red][g=1]
>>
>> \startTEXpage
>>     \starttikzpicture
>>        \fill[red] (0,0) circle (1cm);
>>     \stoptikzpicture
>> \stopTEXpage
>>
>> works ok here and gives green. So, one can collect a list of colors
>> defined in tikz in a colo-imp-tikz.mkiv and load that one if needed.
> 
> I guess it is a bug with pgfplots rather than tikz (which also means
> that it may be easier to pursuade pgfplot maintainers to use low level
> tikz interface, since tikz is already playing nice with context).
> 
> \usemodule[tikz,pgfplots]
> \definecolor[red][g=1]
> 
> \startmode[bug]
> \unprotect
> \pgfutil@definecolor{red}   {rgb} {0,1,0}
> \protect
> \stopmode
> 
> \starttext
> \startTEXpage
>      \starttikzpicture
>        \startaxis
>          \addplot[color=red] coordinates { (0,0) (1,1) };
>        \stopaxis
>      \stoptikzpicture
> \stopTEXpage
> \stoptext
> 
> Aditya
> 
> 
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
> 

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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Alan BRASLAU]

What is the fuss?

\starttext

\startMPcode
  draw origin--right scaled 1cm
    withpen pencircle scaled 1pt
    withcolor gray  ;
\stopMPcode

\stoptext

works just fine... :-)

Alan
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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Hans Hagen]

On 7/12/2016 9:39 PM, Henri Menke wrote:
> Dear Aditya and Hans,
>
> I'm not so sure about it being a bug in pgfplots.  I played a little and
> encountered the following.

As Aditya pointed out, these (probably used for tracing) colors are 
defined in such a way that they don't go via the context resolver. As 
these (few) colors are basically x windows colors, you can start your 
document with:

\usecolors[xwi]

which will set the context colors differently.

>> \usemodule[tikz]
>> \starttext
>>
>> % Original gray
>> \blackrule[color=gray,width=1cm,height=1pt]
>>
>> \starttikzpicture
>>   \draw[gray,line width=1pt] (0,0) -- (1,0);
>> \stoptikzpicture
>>
>> % New colors
>> \definecolor[gray][s=0.5]
>> \unprotect
>> \pgfutil@definecolor{tikzgray}{gray}{0.5}
>> \protect
>>
>> % Now ConTeXt's gray = tikzgray
>> \blackrule[color=gray,width=1cm,height=1pt]

How is that supposed to work? Context will not inherit colors from tikz, 
the most you can expect is the reverse: tikz using context color 
definitions.

>> \starttikzpicture
>>   \draw[tikzgray,line width=1pt] (0,0) -- (1,0);
>> \stoptikzpicture
>>
>> % Inside TikZ gray is still off
>> \starttikzpicture
>>   \draw[gray,line width=1pt] (0,0) -- (1,0);
>> \stoptikzpicture
>>
>> \stoptext

> Cheers,
> Henri
>
> On 07/12/2016 08:23 PM, Aditya Mahajan wrote:
>> On Tue, 12 Jul 2016, Hans Hagen wrote:
>>
>>> On 7/12/2016 5:07 PM, Aditya Mahajan wrote:
>>>> On Tue, 12 Jul 2016, Hans Hagen wrote:
>>>>
>>>>> On 7/12/2016 3:44 PM, Henri Menke wrote:
>>>>>> Dear Hans,
>>>>>>
>>>>>> thanks for your reply.  Indeed there are color definitions in
>>>>>> `pgfutil-context.def`.  However, they are commented out with the
>>> message
>>>>>>
>>>>>>> % no need for x colors (users can load it if needed)
>>>>>>> ...
>>>>>>> %\pgfutil@definecolor{gray}{gray}{0.5}
>>>>>>
>>>>>> If I add
>>>>>>
>>>>>>> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}
>>>>>>
>>>>>> to my document the gray shows up fine.  So that's for sure a feasible
>>>>>> workaround.
>>>>>>
>>>>>> Can you comment on the phrase »no need for x colors (users can load it
>>>>>> if needed)«?  I'm not quite sure what it means and it suggests that
>>>>>> there exists a proper solution to my color problem.
>>>>>
>>>>> normally you want the same colors in tikz images as in context so then
>>>>> defining them in tikz is creating incompatibilities (your case is the
>>>>> reverse and a-typical)
>>>>
>>>> However, without such redefinitions, tikz does not understand ConTeXt
>>>> colors. I use a similar workaround in my documents as well.
>>>
>>> I have no clue what you mean.
>>>
>>> \definecolor[red][g=1]
>>>
>>> \startTEXpage
>>>     \starttikzpicture
>>>        \fill[red] (0,0) circle (1cm);
>>>     \stoptikzpicture
>>> \stopTEXpage
>>>
>>> works ok here and gives green. So, one can collect a list of colors
>>> defined in tikz in a colo-imp-tikz.mkiv and load that one if needed.
>>
>> I guess it is a bug with pgfplots rather than tikz (which also means
>> that it may be easier to pursuade pgfplot maintainers to use low level
>> tikz interface, since tikz is already playing nice with context).
>>
>> \usemodule[tikz,pgfplots]
>> \definecolor[red][g=1]
>>
>> \startmode[bug]
>> \unprotect
>> \pgfutil@definecolor{red}   {rgb} {0,1,0}
>> \protect
>> \stopmode
>>
>> \starttext
>> \startTEXpage
>>      \starttikzpicture
>>        \startaxis
>>          \addplot[color=red] coordinates { (0,0) (1,1) };
>>        \stopaxis
>>      \stoptikzpicture
>> \stopTEXpage
>> \stoptext
>>
>> Aditya
>>
>>
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to the Wiki!
>>
>> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
>> archive  : http://foundry.supelec.fr/projects/contextrev/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
>>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


-- 

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Henri Menke]

On 07/12/2016 10:03 PM, Hans Hagen wrote:
> On 7/12/2016 9:39 PM, Henri Menke wrote:
>> Dear Aditya and Hans,
>>
>> I'm not so sure about it being a bug in pgfplots.  I played a little and
>> encountered the following.
> 
> As Aditya pointed out, these (probably used for tracing) colors are
> defined in such a way that they don't go via the context resolver. As
> these (few) colors are basically x windows colors, you can start your
> document with:
> 
> \usecolors[xwi]
> 
> which will set the context colors differently.

Adding \usecolors[xwi] to the example does not change anything.  Looking
at base/colo-imp-xwi.mkiv revealed, that it does not alter the way
colors are defined, but just defines a huge bunch of additional ones.

> 
>>> \usemodule[tikz]
>>> \starttext
>>>
>>> % Original gray
>>> \blackrule[color=gray,width=1cm,height=1pt]
>>>
>>> \starttikzpicture
>>>   \draw[gray,line width=1pt] (0,0) -- (1,0);
>>> \stoptikzpicture
>>>
>>> % New colors
>>> \definecolor[gray][s=0.5]
>>> \unprotect
>>> \pgfutil@definecolor{tikzgray}{gray}{0.5}
>>> \protect
>>>
>>> % Now ConTeXt's gray = tikzgray
>>> \blackrule[color=gray,width=1cm,height=1pt]
> 
> How is that supposed to work? Context will not inherit colors from tikz,
> the most you can expect is the reverse: tikz using context color
> definitions.

I'm very sorry for the confusion.  What I did was to adjust ConTeXt's
gray to have the same grayscale value as the tikzgray.  As is shown
below, the redefinition of gray does not propagate to TikZ.

> 
>>> \starttikzpicture
>>>   \draw[tikzgray,line width=1pt] (0,0) -- (1,0);
>>> \stoptikzpicture
>>>
>>> % Inside TikZ gray is still off
>>> \starttikzpicture
>>>   \draw[gray,line width=1pt] (0,0) -- (1,0);
>>> \stoptikzpicture
>>>
>>> \stoptext

In pgfutil-context.def there is though

\let\pgfutil@registergray \pgf@context@registergray

So it seems as if gray *should* be propagated from ConTeXt to TikZ,
which apparently takes place when loading TikZ.  Moving
\definecolor[gray][s=0.5] before \usemodule[tikz] shows this behavior.

The question is how to keep colors from ConTeXt and TikZ in sync.

Cheers,
Henri

> 
>> Cheers,
>> Henri
>>
>> On 07/12/2016 08:23 PM, Aditya Mahajan wrote:
>>> On Tue, 12 Jul 2016, Hans Hagen wrote:
>>>
>>>> On 7/12/2016 5:07 PM, Aditya Mahajan wrote:
>>>>> On Tue, 12 Jul 2016, Hans Hagen wrote:
>>>>>
>>>>>> On 7/12/2016 3:44 PM, Henri Menke wrote:
>>>>>>> Dear Hans,
>>>>>>>
>>>>>>> thanks for your reply.  Indeed there are color definitions in
>>>>>>> `pgfutil-context.def`.  However, they are commented out with the
>>>> message
>>>>>>>
>>>>>>>> % no need for x colors (users can load it if needed)
>>>>>>>> ...
>>>>>>>> %\pgfutil@definecolor{gray}{gray}{0.5}
>>>>>>>
>>>>>>> If I add
>>>>>>>
>>>>>>>> \csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}
>>>>>>>
>>>>>>> to my document the gray shows up fine.  So that's for sure a
>>>>>>> feasible
>>>>>>> workaround.
>>>>>>>
>>>>>>> Can you comment on the phrase »no need for x colors (users can
>>>>>>> load it
>>>>>>> if needed)«?  I'm not quite sure what it means and it suggests that
>>>>>>> there exists a proper solution to my color problem.
>>>>>>
>>>>>> normally you want the same colors in tikz images as in context so
>>>>>> then
>>>>>> defining them in tikz is creating incompatibilities (your case is the
>>>>>> reverse and a-typical)
>>>>>
>>>>> However, without such redefinitions, tikz does not understand ConTeXt
>>>>> colors. I use a similar workaround in my documents as well.
>>>>
>>>> I have no clue what you mean.
>>>>
>>>> \definecolor[red][g=1]
>>>>
>>>> \startTEXpage
>>>>     \starttikzpicture
>>>>        \fill[red] (0,0) circle (1cm);
>>>>     \stoptikzpicture
>>>> \stopTEXpage
>>>>
>>>> works ok here and gives green. So, one can collect a list of colors
>>>> defined in tikz in a colo-imp-tikz.mkiv and load that one if needed.
>>>
>>> I guess it is a bug with pgfplots rather than tikz (which also means
>>> that it may be easier to pursuade pgfplot maintainers to use low level
>>> tikz interface, since tikz is already playing nice with context).
>>>
>>> \usemodule[tikz,pgfplots]
>>> \definecolor[red][g=1]
>>>
>>> \startmode[bug]
>>> \unprotect
>>> \pgfutil@definecolor{red}   {rgb} {0,1,0}
>>> \protect
>>> \stopmode
>>>
>>> \starttext
>>> \startTEXpage
>>>      \starttikzpicture
>>>        \startaxis
>>>          \addplot[color=red] coordinates { (0,0) (1,1) };
>>>        \stopaxis
>>>      \stoptikzpicture
>>> \stopTEXpage
>>> \stoptext
>>>
>>> Aditya
>>>
>>>
>>> ___________________________________________________________________________________
>>>
>>> If your question is of interest to others as well, please add an
>>> entry to the Wiki!
>>>
>>> maillist : ntg-context@ntg.nl /
>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
>>> archive  : http://foundry.supelec.fr/projects/contextrev/
>>> wiki     : http://contextgarden.net
>>> ___________________________________________________________________________________
>>>
>>>
>>
>> ___________________________________________________________________________________
>>
>> If your question is of interest to others as well, please add an entry
>> to the Wiki!
>>
>> maillist : ntg-context@ntg.nl /
>> http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
>> archive  : http://foundry.supelec.fr/projects/contextrev/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
>>
>>
> 
> 

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___________________________________________________________________________________

Re: Different colors in LaTeX and ConTeXt

[Hans Hagen]

On 7/12/2016 11:17 PM, Henri Menke wrote:

> Adding \usecolors[xwi] to the example does not change anything.  Looking
> at base/colo-imp-xwi.mkiv revealed, that it does not alter the way
> colors are defined, but just defines a huge bunch of additional ones.

afaiks it has the same 'gray' as tikz 'gray' and that is what you want

> I'm very sorry for the confusion.  What I did was to adjust ConTeXt's
> gray to have the same grayscale value as the tikzgray.  As is shown
> below, the redefinition of gray does not propagate to TikZ.

that is as Aditya mentioned probably due to the fact that some of these 
built in colors are not using the normal color resolver and there's 
nothing we can do about (apart from rewriting part of the tikz color 
interface which is not on my agenda)

> So it seems as if gray *should* be propagated from ConTeXt to TikZ,
> which apparently takes place when loading TikZ.  Moving
> \definecolor[gray][s=0.5] before \usemodule[tikz] shows this behavior.
>
> The question is how to keep colors from ConTeXt and TikZ in sync.

by defining them in your document (at least these 10 or so predefined 
colors)

(you could have similar issues with colors defined in rgb or cmky in one 
or the other)

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________