<table border="0" cellpadding="20px" cellspacing="0" width="100%"><tr><td><div class="breadcrumbs"><a href="1_7_18_4.html" title="About the Non Red Key effect">Previous</a> | <a href="1_7_18_6.html" title="Hiding unwanted objects with Garbage Matte keying effects">Next</a> | <a href="1_7_0_0.html">Applying Effects and Transitions</a> > <a href="1_7_18_0.html">About keying effects</a></div><h4 class="head2">Using the Track Matte Key effect</h4><hr /><ol><p class="paragraph">Use the Track Matte Key effect to show one clip through another, using a third file as a matte that creates transparent areas in the superimposed clip. This effect requires two clips and a matte, each placed on its own track. You may want to set aside an entire track for the matte, because you must disable that track. Depending upon the value of the matte, you can create transparencies of varying levels.</p><p class="paragraph">You can create mattes in various ways:</p><ul><li class="bullet" type="disc">Use the Adobe Title Designer to create text or shapes (use only grayscale images if you plan to key using luma information), save the title, and then import the file as your matte.</li><li class="bullet" type="disc">Create a matte from any clip by using the Chroma Key, Blue Screen Key, Green Screen Key, or Non Red Key keying effect; then choose the effect's Mask Only option.</li><li class="bullet" type="disc">Use Adobe Illustrator or Adobe Photoshop to create a grayscale image and import it into Adobe Premiere Elements.</li></ul></ol><p class="headstep">To apply the Track Matte Key effect:</p><ol><li class="numberstep" type="1" value="1">If the Effect Controls window is not visible, click and hold the Effects button in the task bar and choose Advanced Effects.</li><li class="numberstep" type="1" value="2">If you haven't already done so, add the matte file to the Media window by clicking the Add Media button, navigating to the matte file, and clicking Open. The matte file should preferably be only a single shape, for example, a star or a flower shape.</li><li class="numberstep" type="1" value="3">Add a background clip to a track in the Timeline window.</li><li class="numberstep" type="1" value="4">Add the clip you want to superimpose over the background clip to any track higher than the background clip. This is the clip revealed by the track matte.</li><li class="numberstep" type="1" value="5">On a third track, add the clip that serves as the matte. (If you need to add a third track, drag the matte to an empty area in the Timeline window above the highest video track; a new track is automatically created.)</li><li class="numberstep" type="1" value="6">Right-click the matte clip and choose Enable to remove the check from it, which disables the matte clip. Disabling the matte clip makes it invisible in the project and prevents it from causing any artifacts in the image.</li><li class="numberstep" type="1" value="7">In the Effects window, expand the Video Effects folder and the Keying subfolder, and drag the Track Matte effect to the superimposed clip (the clip above the background clip).</li><li class="numberstep" type="1" value="8">In the Effect Controls window, click the triangle next to the Track Matte name to expand it.</li><li class="numberstep" type="1" value="9">For Matte, choose the video track that contains the matte.</li><li class="numberstep" type="1" value="10">Adjust options as needed:</li><p class="run-inhead">Composite Using</p><p class="paragraph">Select Matte Alpha to composite using the values in the alpha channel of the track matte. Select Matte Luma to composite using the image's luminance values instead.</p><p class="run-inhead">Reverse</p><p class="paragraph">Inverts the values of the track matte.</p><p class="tip"><img src="images/tip.gif" alt="Tip" height="20" width="20" />To retain the original colors in the superimposed clip, use a grayscale image for the matte. Any color in the matte removes the same level of color from the superimposed clip.</p></ol><hr /><div class="breadcrumbs"><a href="1_7_18_4.html" title="About the Non Red Key effect">Previous</a> | <a href="1_7_18_6.html" title="Hiding unwanted objects with Garbage Matte keying effects">Next</a> | <a href="#top">Top</a> | <a href="1_7_0_0.html">Applying Effects and Transitions</a> > <a href="1_7_18_0.html">About keying effects</a></div></td></tr></table>
