<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Transparent colors will be available with version 2.1 that will use the cairo library for graphics rendering. Until then, you have to make do with shaded plots and contour overlays, or a stippling kludge using maskout, const, and gxout grid with 'set gridln off'.<div>--Jennifer</div><div><br><div><br><div><div>On Jan 10, 2011, at 10:41 AM, Becker, Bernd wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>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>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>E-mail:<a href="mailto:bernd.becker@metoffice.gov.uk">bernd.becker@metoffice.gov.uk</a> -<br><a href="http://www.metoffice.gov.uk/research/our-scientists/seasonal-to-decadal/">http://www.metoffice.gov.uk/research/our-scientists/seasonal-to-decadal/</a><br>bernd-becker<br><br><br>_______________________________________________<br>gradsusr mailing list<br>gradsusr@gradsusr.org<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>