* Color rendering & transparency with metapost
@ 2008-11-01 0:38 Renaud Aubin
2008-10-31 23:40 ` luigi scarso
0 siblings, 1 reply; 5+ messages in thread
From: Renaud Aubin @ 2008-11-01 0:38 UTC (permalink / raw)
To: Mailing list for ConTeXt users
Hi,
I have some trouble using a gradient background (solid) with a
transparent element :
\startMPinclusions
def test_shade (expr a, b) =
pickup pencircle scaled 1mm ;
color ca ; ca := \MPcolor{a} ;
color cb ; cb := \MPcolor{b} ;
color cc ; cc := \MPcolor{c} ;
sh := define_linear_shade(origin
shifted(0cm,.5*\overlayheight),origin,ca,cb) ;
fill fullsquare xscaled \overlaywidth yscaled \overlayheight
withshade sh;
draw origin withcolor cc;
draw origin shifted(0cm,-.25*\overlayheight) withcolor cc;
enddef ;
\stopMPinclusions
\setupcolors[state=start]
\definecolor[a][r=.57254902,g=.784313725,b=.917647059]
\definecolor[b][white]
\definecolor[c][darkred]
\starttext
\defineoverlay[bgoverlay][\uniqueMPgraphic{bg_top_shade}]
\setupbackgrounds[page][background=bgoverlay]
\startuniqueMPgraphic{bg_top_shade}
test_shade(origin, origin shifted(0cm,1cm));
draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight)
withcolor transparent(1,0.5,white) withpen pencircle scaled 2cm;
%%%%%%%% If you comment out the previous line the color rendering is
definitelly different...
\stopuniqueMPgraphic
\input knuth
\stoptext
I have searched the ML without success, any idea ?
Regards,
Renaud
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: Color rendering & transparency with metapost
2008-11-01 0:38 Color rendering & transparency with metapost Renaud Aubin
@ 2008-10-31 23:40 ` luigi scarso
2008-11-01 1:06 ` Renaud Aubin
0 siblings, 1 reply; 5+ messages in thread
From: luigi scarso @ 2008-10-31 23:40 UTC (permalink / raw)
To: mailing list for ConTeXt users
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On Sat, Nov 1, 2008 at 1:38 AM, Renaud Aubin <aubin@nibua-r.org> wrote:
> Hi,
>
> I have some trouble using a gradient background (solid) with a
> transparent element :
>
> \startMPinclusions
> def test_shade (expr a, b) =
> pickup pencircle scaled 1mm ;
> color ca ; ca := \MPcolor{a} ;
> color cb ; cb := \MPcolor{b} ;
> color cc ; cc := \MPcolor{c} ;
> sh := define_linear_shade(origin
> shifted(0cm,.5*\overlayheight),origin,ca,cb) ;
> fill fullsquare xscaled \overlaywidth yscaled \overlayheight
> withshade sh;
> draw origin withcolor cc;
> draw origin shifted(0cm,-.25*\overlayheight) withcolor cc;
> enddef ;
> \stopMPinclusions
>
> \setupcolors[state=start]
> \definecolor[a][r=.57254902,g=.784313725,b=.917647059]
> \definecolor[b][white]
> \definecolor[c][darkred]
> \starttext
>
> \defineoverlay[bgoverlay][\uniqueMPgraphic{bg_top_shade}]
> \setupbackgrounds[page][background=bgoverlay]
> \startuniqueMPgraphic{bg_top_shade}
> test_shade(origin, origin shifted(0cm,1cm));
> draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight)
> withcolor transparent(1,0.5,white) withpen pencircle scaled 2cm;
>
> %%%%%%%% If you comment out the previous line the color rendering is
> definitelly different...
>
> \stopuniqueMPgraphic
>
> \input knuth
>
> \stoptext
>
This is my test.
Where is the problem ?
minimals-beta
Linux luigicasa-laptop 2.6.24-21-generic #1 SMP Tue Oct 21 23:43:45 UTC 2008
i686 GNU/Linux
This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown
ConTeXt MtxRun | current version: 2008.10.31 13:58
--
luigi
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___________________________________________________________________________________
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 : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: Color rendering & transparency with metapost
2008-10-31 23:40 ` luigi scarso
@ 2008-11-01 1:06 ` Renaud Aubin
2008-11-01 0:36 ` luigi scarso
2008-11-01 1:11 ` Renaud Aubin
0 siblings, 2 replies; 5+ messages in thread
From: Renaud Aubin @ 2008-11-01 1:06 UTC (permalink / raw)
To: mailing list for ConTeXt users
Thank Luigi for your response, the problem is that the background color
rendering isn't the same if you comment out or not the following line :
draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight) withcolor
transparent(1,0.5,white) withpen pencircle scaled 2cm;
After some experiments, the problem is solved ( hence not understood
???) using rgb=no in setupcolors...
It's maybe a viewer-centric problem : I use acroread 8.1.2 under linux.
Renaud
luigi scarso a écrit :
>
> This is my test.
> Where is the problem ?
>
> minimals-beta
> Linux luigicasa-laptop 2.6.24-21-generic #1 SMP Tue Oct 21 23:43:45
> UTC 2008 i686 GNU/Linux
> This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown
> ConTeXt MtxRun | current version: 2008.10.31 13:58
>
>
>
> --
> luigi
>
> ------------------------------------------------------------------------
>
> ___________________________________________________________________________________
> 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 : https://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 : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Color rendering & transparency with metapost
2008-11-01 1:06 ` Renaud Aubin
@ 2008-11-01 0:36 ` luigi scarso
2008-11-01 1:11 ` Renaud Aubin
1 sibling, 0 replies; 5+ messages in thread
From: luigi scarso @ 2008-11-01 0:36 UTC (permalink / raw)
To: mailing list for ConTeXt users
[-- Attachment #1.1: Type: text/plain, Size: 672 bytes --]
On Sat, Nov 1, 2008 at 2:06 AM, Renaud Aubin <aubin@nibua-r.org> wrote:
> Thank Luigi for your response, the problem is that the background color
> rendering isn't the same if you comment out or not the following line :
> draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight) withcolor
> transparent(1,0.5,white) withpen pencircle scaled 2cm;
>
true
>
> After some experiments, the problem is solved ( hence not understood
> ???) using rgb=no in setupcolors...
>
They seem differents again
>
> It's maybe a viewer-centric problem : I use acroread 8.1.2 under linux.
>
no, I don't believe.
Try to investigate with \pdfcompresslevel0 at the beginning
--
luigi
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___________________________________________________________________________________
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 : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Color rendering & transparency with metapost
2008-11-01 1:06 ` Renaud Aubin
2008-11-01 0:36 ` luigi scarso
@ 2008-11-01 1:11 ` Renaud Aubin
1 sibling, 0 replies; 5+ messages in thread
From: Renaud Aubin @ 2008-11-01 1:11 UTC (permalink / raw)
To: mailing list for ConTeXt users
I must add that I have defined the a color with cmyk.
Renaud Aubin a écrit :
> Thank Luigi for your response, the problem is that the background color
> rendering isn't the same if you comment out or not the following line :
> draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight) withcolor
> transparent(1,0.5,white) withpen pencircle scaled 2cm;
>
> After some experiments, the problem is solved ( hence not understood
> ???) using rgb=no in setupcolors...
>
> It's maybe a viewer-centric problem : I use acroread 8.1.2 under linux.
>
> Renaud
>
> luigi scarso a écrit :
>
>> This is my test.
>> Where is the problem ?
>>
>> minimals-beta
>> Linux luigicasa-laptop 2.6.24-21-generic #1 SMP Tue Oct 21 23:43:45
>> UTC 2008 i686 GNU/Linux
>> This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown
>> ConTeXt MtxRun | current version: 2008.10.31 13:58
>>
>>
>>
>> --
>> luigi
>>
>> ------------------------------------------------------------------------
>>
>> ___________________________________________________________________________________
>> 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 : https://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 : https://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 : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread
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2008-11-01 0:38 Color rendering & transparency with metapost Renaud Aubin
2008-10-31 23:40 ` luigi scarso
2008-11-01 1:06 ` Renaud Aubin
2008-11-01 0:36 ` luigi scarso
2008-11-01 1:11 ` Renaud Aubin
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