On Mon, Jan 10, 2011 at 10:41 AM, Becker, Bernd <span dir="ltr"><<a href="mailto:bernd.becker@metoffice.gov.uk">bernd.becker@metoffice.gov.uk</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello!<br>
<br>
How can I define transparent colours,<br>
that produce visualy distinguishable hues when overlapped?<br>
<br>
I would like to define areas on shaded plot that are,<br>
say, windy and warm, and where these areas overlap<br>
I would like to visualize that the ovelap area is windy and warm,<br>
without<br>
having to define another colour for that specific region.<br>
<br>
Rather than defined colors by RGB, I guess, I am asking if it is<br>
possible to<br>
define colours in grads using the HSLA colour model.<br>
<br></blockquote><div><br></div><div>The gxyat extension includes a "set_rgba" command that works much like "set rgb" but allows you to additionally specify the alpha channel (opacity) for each color. Search the list, I posted something not that long ago. You need the opengrads bundle distribution for using this feature.</div>
<div><br></div><div> Arlindo</div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
best regards,<br>
Bernd.<br>
<br>
<br>
--<br>
Bernd Becker Climate Impacts Product Development<br>
Met Office Hadley Centre FitzRoy Road Exeter Devon EX1 3PB United<br>
Kingdom<br>
Tel.: +44 (0) 1392 884511 Fax: +44 (0)870 900 5050<br>
<a href="mailto:E-mail%3Abernd.becker@metoffice.gov.uk">E-mail:bernd.becker@metoffice.gov.uk</a> -<br>
<a href="http://www.metoffice.gov.uk/research/our-scientists/seasonal-to-decadal/
bernd-becker" target="_blank">http://www.metoffice.gov.uk/research/our-scientists/seasonal-to-decadal/<br>
bernd-becker</a><br>
<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>