From: "luigi scarso" <luigi.scarso@gmail.com>
To: "mailing list for ConTeXt users" <ntg-context@ntg.nl>
Subject: Re: Color rendering & transparency with metapost
Date: Sat, 1 Nov 2008 00:40:46 +0100 [thread overview]
Message-ID: <fe8d59da0810311640s60807eceh251177ded24ce02b@mail.gmail.com> (raw)
In-Reply-To: <490BA4E8.1010208@nibua-r.org>
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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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next prev parent reply other threads:[~2008-10-31 23:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-01 0:38 Renaud Aubin
2008-10-31 23:40 ` luigi scarso [this message]
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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