Ok.<br>ColorMatrix in the current svn (17306) uses premultiplied alpha. So this should be changed.<br>But how can premultiplication be undone? all data is lost when alpha~0, isn&#39;t it?<br><br>By the way, I guess premultiplication is also involved in the bug affecting turbulence: when transformed (rotated for instance), turbulence becomes more transparent...<br>
jfb.<br><br><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br></blockquote></div><br>