From: Alan BRASLAU <alan.braslau@cea.fr>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: invert colors in \externalfigure
Date: Wed, 20 Jan 2016 11:35:50 -0700 [thread overview]
Message-ID: <20160120113550.40bfe439@cea.fr> (raw)
In-Reply-To: <569FBC55.9030200@gmx.es>
On Wed, 20 Jan 2016 17:56:53 +0100
Pablo Rodriguez <oinos@gmx.es> wrote:
> On 01/20/2016 01:19 PM, Wolfgang Schuster wrote:
> >> Pablo Rodriguez 20. Januar 2016 um 13:10
> >> [...]
> >> How can I invert the colors in the external figure without having
> >> to edit the image file?
> >>
> >> Many thanks for your help,
> > You have to use the Adobe Reader to view the PDF.
>
> I’m afraid that I’m on Linux and I don’t have Adobe Reader installed.
Not just on Linux... (Adobe reader is a notorious security hole).
With MetaFun, you can invert the colors using:
\startMPcode
draw whatever... ;
currentpicture := inverted currentpicture ;
\stopMPcode
Unfortunately, this does *not* work with externalfigure, i.e.
\startMPcode
draw externalfigure("cow") ;
currentpicture := inverted currentpicture ;
\stopMPcode
or
\startMPcode
draw rawtextext("\externalfigure [cow]") ;
currentpicture := inverted currentpicture ;
\stopMPcode
as inverted (a macro) operates on all the elements of the picture.
I find it easiest to use ImageMagick or gimp to invert the colors and
save this in a second image file.
Alan
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next prev parent reply other threads:[~2016-01-20 18:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-20 12:10 Pablo Rodriguez
2016-01-20 12:19 ` Wolfgang Schuster
2016-01-20 16:56 ` Pablo Rodriguez
2016-01-20 18:35 ` Alan BRASLAU [this message]
2016-01-22 20:39 ` Pablo Rodriguez
2016-01-20 13:09 ` Marco Patzer
2016-01-20 17:12 ` Pablo Rodriguez
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