From jorismeys at gmail.com  Tue Feb 15 14:40:26 2011
From: jorismeys at gmail.com (Joris Meys)
Date: Tue, 15 Feb 2011 14:40:26 +0100
Subject: [Rd] readPNG gives warnings and doesn't execute sample code
 from help files
In-Reply-To: <loom.20110215T141928-342@post.gmane.org>
References: <AANLkTinVuFBRCoHHjQ_fAF5BXFFQ+sQPm7-Yq79MtqOL@mail.gmail.com>
	<C425001D-55D4-4411-BAE2-8308E76E310B@r-project.org>
	<AANLkTi=dW4Ch7CgRhsXx-Fz4LrkbuDHdm9sgLaKY672-@mail.gmail.com>
	<loom.20110215T141928-342@post.gmane.org>
Message-ID: <AANLkTi=vq+JZd3Nvtr5VDMrLveei60VUxXei_bvqH4hw@mail.gmail.com>

Thx again for your answer. I've tried X11() - which is supposed to
support alpha per pixel as well, but on Windows that's still no avail.
So basically, on Windows I can forget about alpha?

Cheers
Jors

On Tue, Feb 15, 2011 at 2:20 PM, Ben Bolker <bbolker at gmail.com> wrote:
> Joris Meys <jorismeys <at> gmail.com> writes:
>
>>
>> I believed the standard plotting device on R in 2.12.1 would support
>> per-pixel alpha. It does support alpha, as
>>
>> ?plot(1:2,type="l")
>> ?polygon(c(1,1,2,2),c(1,2,2,1),col=rgb(60,100,60,60,maxColorValue=255))
>>
>> plots correctly. Which device should I use then?
>
> See
>
> http://developer.r-project.org/Raster/raster-RFC.html
>
> (near the bottom of the page, where it explains that the
> Windows device supports alpha but not per-pixel alpha ...)
>
> ?cheers
> ? ?Ben Bolker
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>



-- 
Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

tel : +32 9 264 59 87
Joris.Meys at Ugent.be
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[Rd] readPNG gives warnings and doesn't execute sample code from help files
Joris Meys