oops, I think there was error in this patch, yet even after fixing it I can&#39;t see obvious result? (some other  modes also show only one obvious colored track, not overlays.. so I think different, more complex test project is needed) <div><br></div><div><br><br>On Saturday, June 26, 2021, Andrew Randrianasulu &lt;<a href="mailto:randrianasulu@gmail.com">randrianasulu@gmail.com</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">see  attached patch (it copypastes badly)<div><br></div><div>it compiles but I tried solid-color track over fading png text (as in black_flash.xml) and I can&#39;t see it working? </div><div><br></div><div>I just hope it can serve as guide what to modify for adding new modes.. </div><div><br></div><div>I tried to write down math from this page:</div><div><a href="https://natron.readthedocs.io/en/rb-2.3/plugins/net.sf.openfx.MergePlugin.html" target="_blank">https://natron.readthedocs.io/<wbr>en/rb-2.3/plugins/net.sf.<wbr>openfx.MergePlugin.html</a></div><div><br></div><div><br></div>
</blockquote></div>