<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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. <div>--Jennifer<br><div><br><div><div>On Oct 19, 2010, at 3:57 PM, Jofre Janué wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div><br> Sorry, I repeat the question with the correct subject:<br><br>I am new and for this reason I d'ont know if you have talked about it, but<br>any way, Does anybody knows how can we print an alpha chanal image file from<br>GrADS?<br>Thanks.<br><br><br>--------------------------------------------------<br>From: <<a href="mailto:gradsusr-request@gradsusr.org">gradsusr-request@gradsusr.org</a>><br>Sent: Tuesday, October 19, 2010 5:23 PM<br>To: <<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>><br>Subject: gradsusr Digest, Vol 8, Issue 31<br><br><blockquote type="cite">Send gradsusr mailing list submissions to<br></blockquote><blockquote type="cite"><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">To subscribe or unsubscribe via the World Wide Web, visit<br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/mailman/listinfo/gradsusr">http://gradsusr.org/mailman/listinfo/gradsusr</a><br></blockquote><blockquote type="cite">or, via email, send a message with subject or body 'help' to<br></blockquote><blockquote type="cite"><a href="mailto:gradsusr-request@gradsusr.org">gradsusr-request@gradsusr.org</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">You can reach the person managing the list at<br></blockquote><blockquote type="cite"><a href="mailto:gradsusr-owner@gradsusr.org">gradsusr-owner@gradsusr.org</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">When replying, please edit your Subject line so it is more specific<br></blockquote><blockquote type="cite">than "Re: Contents of gradsusr digest..."<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Today's Topics:<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"> 1. Re: Problem with ipcc data (Roger Rodrigues Torres)<br></blockquote><blockquote type="cite"> 2. CDIFF Versus HDIVG? (LeeJoice, Robert N)<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">----------------------------------------------------------------------<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Message: 1<br></blockquote><blockquote type="cite">Date: Tue, 19 Oct 2010 17:03:22 -0200<br></blockquote><blockquote type="cite">From: Roger Rodrigues Torres <<a href="mailto:roger.torres@cptec.inpe.br">roger.torres@cptec.inpe.br</a>><br></blockquote><blockquote type="cite">Subject: Re: [gradsusr] Problem with ipcc data<br></blockquote><blockquote type="cite">To: GrADS Users Forum <<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>><br></blockquote><blockquote type="cite">Message-ID:<br></blockquote><blockquote type="cite"><<a href="mailto:AANLkTikEyW_mDXm3+43qQ6VwDq=uacU3DnAOuyke-5tz@mail.gmail.com">AANLkTikEyW_mDXm3+43qQ6VwDq=uacU3DnAOuyke-5tz@mail.gmail.com</a>><br></blockquote><blockquote type="cite">Content-Type: text/plain; charset="iso-8859-1"<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Dear Ismaila,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">I'm working with this dataset and I faced the same problem with you.<br></blockquote><blockquote type="cite">I found 2 manners to cope with it:<br></blockquote><blockquote type="cite">1) It is possible to open with an old version of Grads (grads-1.9b4) or<br></blockquote><blockquote type="cite">2) to trasform these data to Grb by CDO.<br></blockquote><blockquote type="cite">But, as mentioned by our colleague Jennifer Adams<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">"Do not use 'sdfopen' with version 1.9 to look at files with a 365-day<br></blockquote><blockquote type="cite">calendar -- the time axis info will likely be incorrect. You must use <br></blockquote><blockquote type="cite">'open'<br></blockquote><blockquote type="cite">or 'xdfopen' and provide the full TDEF information. This has been <br></blockquote><blockquote type="cite">discussed<br></blockquote><blockquote type="cite">at length in the forum, see for example: "<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/2009-January/008103.html">http://gradsusr.org/pipermail/gradsusr/2009-January/008103.html</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/2009-April/008489.html">http://gradsusr.org/pipermail/gradsusr/2009-April/008489.html</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/2009-December/010064.html">http://gradsusr.org/pipermail/gradsusr/2009-December/010064.html</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Cheers,<br></blockquote><blockquote type="cite">Roger<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">2010/10/19 Ismaila Diallo <<a href="mailto:ismailadiallo64@yahoo.fr">ismailadiallo64@yahoo.fr</a>><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">Dear Grads user<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">i have ipcc data who are in netcdf format and i can't open them whith<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">sdfopen.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Can anyone help me or give me some idea who will help me to resolve this<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">problem<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">thanks and best whishes<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">_______________________________________________<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">gradsusr mailing list<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://gradsusr.org/mailman/listinfo/gradsusr">http://gradsusr.org/mailman/listinfo/gradsusr</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">-- <br></blockquote><blockquote type="cite">Roger Rodrigues Torres<br></blockquote><blockquote type="cite">Ph.D. Student<br></blockquote><blockquote type="cite">National Institute for Space Research (INPE)<br></blockquote><blockquote type="cite">Center for Weather Forecast and Climate Studies (CPTEC)<br></blockquote><blockquote type="cite">Phone: 55 12 3186-9541<br></blockquote><blockquote type="cite">Personal Webpage: <a href="http://rtorres.webnode.com.br">http://rtorres.webnode.com.br</a><br></blockquote><blockquote type="cite">-------------- next part --------------<br></blockquote><blockquote type="cite">An HTML attachment was scrubbed...<br></blockquote><blockquote type="cite">URL: <br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/attachments/20101019/c508e619/attachment-0001.html">http://gradsusr.org/pipermail/gradsusr/attachments/20101019/c508e619/attachment-0001.html</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">------------------------------<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Message: 2<br></blockquote><blockquote type="cite">Date: Tue, 19 Oct 2010 14:27:26 -0500<br></blockquote><blockquote type="cite">From: "LeeJoice, Robert N" <<a href="mailto:rnleejoi@nps.edu">rnleejoi@nps.edu</a>><br></blockquote><blockquote type="cite">Subject: [gradsusr] CDIFF Versus HDIVG?<br></blockquote><blockquote type="cite">To: <<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>><br></blockquote><blockquote type="cite">Message-ID: <<a href="mailto:C8E35B51.2807%rnleejoi@nps.edu">C8E35B51.2807%rnleejoi@nps.edu</a>><br></blockquote><blockquote type="cite">Content-Type: text/plain; charset="iso-8859-1"<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">I was wondering if there is a difference in the differencing scheme <br></blockquote><blockquote type="cite">between<br></blockquote><blockquote type="cite">CDIFF and HDIVG. I ask because I did a modified example from the<br></blockquote><blockquote type="cite">documentation, i.e., divergence vice vorticity. The documentation states<br></blockquote><blockquote type="cite">that CDIFF uses centered differencing. HDIVG says the same. The images<br></blockquote><blockquote type="cite">suggest something else unless I?m missing something.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">CDIFF file<br></blockquote><blockquote type="cite">if(var='DIV')<br></blockquote><blockquote type="cite"> 'run bluewhitered.gs -2.0 .5 10'<br></blockquote><blockquote type="cite"> 'define dv = cdiff(vgrdprs,x)'<br></blockquote><blockquote type="cite"> 'define dx = cdiff(lon,x)*3.1416/180'<br></blockquote><blockquote type="cite"> 'define du = cdiff(ugrdprs*cos(lat*3.1416/180),y)'<br></blockquote><blockquote type="cite"> 'define dy = cdiff(lat,y)*3.1416/180'<br></blockquote><blockquote type="cite"> 'display (du/dx+dv/dy)*1e5/(6.37e6*cos(lat*3.1416/180))'<br></blockquote><blockquote type="cite"> 'run cbarn.gs 0.8 1 10.4 4.7'<br></blockquote><blockquote type="cite">endif<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">HDIVG file<br></blockquote><blockquote type="cite">if(var='DIV')<br></blockquote><blockquote type="cite"> 'run bluewhitered.gs -2.0 .5 10'<br></blockquote><blockquote type="cite"> 'd 1e5*hdivg(ugrdprs,vgrdprs)'<br></blockquote><blockquote type="cite"> 'run cbarn.gs 0.8 1 10.4 4.7'<br></blockquote><blockquote type="cite">Endif<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Here are the images in order...<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Thank you for any comments,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Robert LeeJoice<br></blockquote><blockquote type="cite">PhD Candidate, Naval Postgraduate School<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">-------------- next part --------------<br></blockquote><blockquote type="cite">An HTML attachment was scrubbed...<br></blockquote><blockquote type="cite">URL: <br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/attachments/20101019/47d7cefc/attachment.html">http://gradsusr.org/pipermail/gradsusr/attachments/20101019/47d7cefc/attachment.html</a><br></blockquote><blockquote type="cite">-------------- next part --------------<br></blockquote><blockquote type="cite">A non-text attachment was scrubbed...<br></blockquote><blockquote type="cite">Name: Sinlaku.DIV-gfsfnl.2008090806a129.gif<br></blockquote><blockquote type="cite">Type: video/x-flv<br></blockquote><blockquote type="cite">Size: 141194 bytes<br></blockquote><blockquote type="cite">Desc: not available<br></blockquote><blockquote type="cite">Url : <br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/attachments/20101019/47d7cefc/attachment.flv">http://gradsusr.org/pipermail/gradsusr/attachments/20101019/47d7cefc/attachment.flv</a><br></blockquote><blockquote type="cite">-------------- next part --------------<br></blockquote><blockquote type="cite">A non-text attachment was scrubbed...<br></blockquote><blockquote type="cite">Name: Sinlaku.DIV-gfsfnl.2008090806a129a.gif<br></blockquote><blockquote type="cite">Type: video/x-flv<br></blockquote><blockquote type="cite">Size: 123488 bytes<br></blockquote><blockquote type="cite">Desc: not available<br></blockquote><blockquote type="cite">Url : <br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/attachments/20101019/47d7cefc/attachment-0001.flv">http://gradsusr.org/pipermail/gradsusr/attachments/20101019/47d7cefc/attachment-0001.flv</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">------------------------------<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">_______________________________________________<br></blockquote><blockquote type="cite">gradsusr mailing list<br></blockquote><blockquote type="cite"><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/mailman/listinfo/gradsusr">http://gradsusr.org/mailman/listinfo/gradsusr</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">End of gradsusr Digest, Vol 8, Issue 31<br></blockquote><blockquote type="cite">***************************************<br></blockquote><blockquote type="cite"><br></blockquote>_______________________________________________<br>gradsusr mailing list<br><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>http://gradsusr.org/mailman/listinfo/gradsusr<br></div></blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>--</div><div>Jennifer M. Adams</div><div>IGES/COLA</div><div>4041 Powder Mill Road, Suite 302</div><div>Calverton, MD 20705</div><div><a href="mailto:jma@cola.iges.org">jma@cola.iges.org</a></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></span></div></span> </div><br></div></div></body></html>