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</div><div class="twikiRevInfo"><span class="twikiGrayText"><span class="twikiToolbarElem">Cinelerra.CompositingProjector</span><span class="twikiToolbarElem">r1.10 - 26 Jan 2004 - 00:48 - <a class="twikiLink" href="../Main/AlexFerrer">AlexFerrer</a></span><span class="twikiToolbarElem"><a href="#TopicEnd">topic&nbsp;end</a></span></span></div></div>
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<img src="../../../pub/Cinelerra/CinelerraImages/button_compositor_projector.png" alt="button_compositor_projector.png" />
<h2><a name="CompositingProjector_Compositing"> </a><a name="_CompositingProjector_Compositin"> </a> <a class="twikiLink" href="CompositingProjector">Compositing Projector Controls</a> </h2>
In Cinelerra's compositing pipeline, the <a class="twikiLink" href="CompositingProjector">CompositingProjector</a> is the mechanism that " <em>projects</em> " images in the temporary into the output. We call this mechanism a " <code><b>projector</b></code> ", because the rendering process of the images is analogous to a film projecting into a canvas for the final output.
<p />
<img src="../../../pub/Cinelerra/CinelerraImages/projector_concept.png" alt="projector_concept.png" />
<p />
The purpose of the projector, is to place the contents of the <a class="twikiLink" href="CompositingTemporary">temporary</a> _ (earlier captured by the <a class="twikiLink" href="CompositingCamera">camera</a>)_  into the project's output. The intention of the projector is to composite several sources ( <em>from the various tracks</em> ) into one final output track. 
<p />
<h4><a name="The_projector_alignment_frame"> </a> The projector alignment frame </h4>
The projector alignment frame is identical to the <a class="twikiLink" href="CompositingCamera">camera's viewport</a>, except that it  guides where on the output canvas to put the contents of each temporary. (<em>and the projection size too</em>)
<p />
<img src="../../../pub/Cinelerra/CinelerraImages/projector_screen.png" alt="projector_screen.png" /><br> <strong><em>Compositor window on projector mode with 3 composited tracks on</em></strong>
<p />
<h3><a name="Controlling_the_position_of_the"> </a><a name="Controlling_the_position_of_the_"> </a> Controlling the position of the projector. </h3>
<p />
Each track-temporary has a corresponding projector. To select the track you wish to work on :
<ul>
<li> On the <a class="twikiLink" href="PatchBay">PatchBay</a> for the track you want, Single select the track. (<em>shift arm</em>)
</li>
</ul>
<p />
To control the position of the projector for the selected track, 
<ul>
<li> Click the <img src="../../../pub/Cinelerra/CinelerraImages/button_compositor_projector.png" alt="button_compositor_projector.png" /> projector button to enable projector editing mode. <em>(A guide box appears in the video window.)</em> 
</li>
<li> Drag over the video window causes to move the guide box. (<em>along with the video</em>)
</li>
<li> <img src="../../../pub/TWiki/TWikiDocGraphics/warning.gif" border="0" alt="ALERT!" width="16" height="16" /> The adjustments only affect the selected track.
</li>
</ul>
<p />
To change the size of the image projected,
<ul>
<li> Shift-drag the video window.
</li>
</ul>
<p />
To work on any other track, go back to the <a class="twikiLink" href="MainProgram">MainProgram</a> <img src="../../../pub/TWiki/TWikiDocGraphics/arrowright.gif" border="0" alt="MOVED TO..." width="16" height="16" /> <a class="twikiLink" href="PatchBay">PatchBay</a> and single select the track. 
<p />
<h3><a name="Compositing_Overlapping_Tracks"> </a> Compositing Overlapping Tracks </h3>
When various traks are projected on the output, tracks may overlap each other. In such cases, the first track on the timeline, will be on top, the second below the first and so on. <img src="../../../pub/TWiki/TWikiDocGraphics/tip.gif" border="0" alt="TIP" width="16" height="16" /> To change the order of the tracks use the <a class="twikiLink" href="MediaTrack">pop-up menu</a> available at each track.
<p />
When the compositor finds overlaping tracks, it mixes them based on the <a class="twikiLink" href="OverlayMode">OverlayMode</a> set for each track on the <a class="twikiLink" href="TrackControl">TrackControls</a>. 
<p />
<p />
<h3><a name="Projector_Tool"> </a> Projector Tool </h3>
To activate the projector tool, press the <img src="../../../pub/Cinelerra/CinelerraImages/button_compositor_info.png" alt="button_compositor_info.png" /> button. 
<p />
<img src="../../../pub/Cinelerra/CinelerraImages/compositor_campro_tool.png" alt="compositor_campro_tool.png" />
<p />
The tool window shows x, y, and z coordinates. By either tumbling or entering text directly, the projector can be precisely positioned. 
<p />
<p />
<h4><a name="Auto_Justification_controls"> </a> Auto Justification controls </h4>
 The justify buttons, automatically align the projector  to any one of nine pre-set justify positions. The positions are: 
<ul>
<li> <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_left.png" alt="button_justify_left.png" /> Left 
</li>
<li> <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_centerH.png" alt="button_justify_centerH.png" /> Center Horizontal 
</li>
<li> <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_right.png" alt="button_justify_right.png" /> Right  
</li>
<li> <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_top.png" alt="button_justify_top.png" /> Top
</li>
<li> <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_centerV.png" alt="button_justify_centerV.png" /> Center Vertical
</li>
<li> <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_bottom.png" alt="button_justify_bottom.png" /> Bottom
</li>
</ul>
<p />
Merely by selecting left justify and top justify <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_left.png" alt="button_justify_left.png" /> <img src="../../../pub/Cinelerra/CinelerraImages/button_justify_top.png" alt="button_justify_top.png" />  , the projector displays the reduced image from the top left corner of the temporary in the center of the output. 
<p />
-- <a class="twikiLink" href="../Main/AlexFerrer">AlexFerrer</a> - 21 Dec 2003
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