[gradsusr] Alpha channel

Tue Oct 19 16:34:39 EDT 2010

If by 'alpha channel' you mean colors with a transparency level  
somewhere between 0 and 1, then the answer is no; GrADS in its current  
form doesn't support alpha channel transparency. However, we are  
working on implementing a new graphics rendering library (cairo) which  
does support an alpha channel in color definitions, so it will be  
supported in the future. Please don't ask when.
--Jennifer

On Oct 19, 2010, at 3:57 PM, Jofre Janué wrote:

>
> Sorry, I repeat the question with the correct subject:
>
> I am new and for this reason I d'ont know if you have talked about  
> it, but
> any way, Does anybody knows how can we print an alpha chanal image  
> file from
> GrADS?
> Thanks.
>
>
> --------------------------------------------------
> From: <gradsusr-request at gradsusr.org>
> Sent: Tuesday, October 19, 2010 5:23 PM
> To: <gradsusr at gradsusr.org>
> Subject: gradsusr Digest, Vol 8, Issue 31
>
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>> Today's Topics:
>>
>>  1. Re: Problem with ipcc data (Roger Rodrigues Torres)
>>  2. CDIFF Versus HDIVG? (LeeJoice, Robert N)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Tue, 19 Oct 2010 17:03:22 -0200
>> From: Roger Rodrigues Torres <roger.torres at cptec.inpe.br>
>> Subject: Re: [gradsusr] Problem with ipcc data
>> To: GrADS Users Forum <gradsusr at gradsusr.org>
>> Message-ID:
>> <AANLkTikEyW_mDXm3+43qQ6VwDq=uacU3DnAOuyke-5tz at mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Dear Ismaila,
>>
>> I'm working with this dataset and I faced the same problem with you.
>> I found 2 manners to cope with it:
>> 1) It is possible to open with an old version of Grads  
>> (grads-1.9b4) or
>> 2) to trasform these data to Grb by CDO.
>> But, as mentioned by our colleague Jennifer Adams
>>
>> "Do not use 'sdfopen' with version 1.9 to look at files with a 365- 
>> day
>> calendar -- the time axis info will likely be incorrect. You must use
>> 'open'
>> or 'xdfopen' and provide the full TDEF information. This has been
>> discussed
>> at length in the forum, see for example: "
>>
>>
>>
>> http://gradsusr.org/pipermail/gradsusr/2009-January/008103.html
>>
>> http://gradsusr.org/pipermail/gradsusr/2009-April/008489.html
>>
>> http://gradsusr.org/pipermail/gradsusr/2009-December/010064.html
>>
>>
>> Cheers,
>> Roger
>>
>> 2010/10/19 Ismaila Diallo <ismailadiallo64 at yahoo.fr>
>>
>>> Dear Grads user
>>> i have ipcc data who are in netcdf format and i can't open them  
>>> whith
>>> sdfopen.
>>> Can anyone help me or give me some idea who will help me to  
>>> resolve this
>>> problem
>>> thanks and best whishes
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
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>>
>>
>>
>> -- 
>> Roger Rodrigues Torres
>> Ph.D. Student
>> National Institute for Space Research (INPE)
>> Center for Weather Forecast and Climate Studies (CPTEC)
>> Phone: 55 12 3186-9541
>> Personal Webpage: http://rtorres.webnode.com.br
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>> ------------------------------
>>
>> Message: 2
>> Date: Tue, 19 Oct 2010 14:27:26 -0500
>> From: "LeeJoice, Robert N" <rnleejoi at nps.edu>
>> Subject: [gradsusr] CDIFF Versus HDIVG?
>> To: <gradsusr at gradsusr.org>
>> Message-ID: <C8E35B51.2807%rnleejoi at nps.edu>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> I was wondering if there is a difference in the differencing scheme
>> between
>> CDIFF and HDIVG.  I ask because I did a modified example from the
>> documentation, i.e., divergence vice vorticity.  The documentation  
>> states
>> that CDIFF uses centered differencing.  HDIVG says the same.  The  
>> images
>> suggest something else unless I?m missing something.
>>
>> CDIFF file
>> if(var='DIV')
>>         'run bluewhitered.gs -2.0 .5 10'
>>         'define dv = cdiff(vgrdprs,x)'
>>         'define dx = cdiff(lon,x)*3.1416/180'
>>         'define du = cdiff(ugrdprs*cos(lat*3.1416/180),y)'
>>         'define dy = cdiff(lat,y)*3.1416/180'
>>         'display (du/dx+dv/dy)*1e5/(6.37e6*cos(lat*3.1416/180))'
>>         'run cbarn.gs 0.8 1 10.4 4.7'
>> endif
>>
>> HDIVG file
>> if(var='DIV')
>>       'run bluewhitered.gs -2.0 .5 10'
>>       'd 1e5*hdivg(ugrdprs,vgrdprs)'
>>       'run cbarn.gs 0.8 1 10.4 4.7'
>> Endif
>>
>> Here are the images in order...
>>
>> Thank you for any comments,
>>
>> Robert LeeJoice
>> PhD Candidate, Naval Postgraduate School
>>
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org

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