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</div><div class="twikiRevInfo"><span class="twikiGrayText"><span class="twikiToolbarElem">Cinelerra.AnalogTVCleaning</span><span class="twikiToolbarElem">r1.2 - 21 Dec 2003 - 19:49 - <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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<h3><a name="AnalogTVCleaning"> </a> <a class="twikiLink" href="AnalogTVCleaning">AnalogTVCleaning</a> </h3>
The picture quality on analog TV is horrible but you can do things in Cinelerra to make it look more like it did in the studio.
<p />
First, when capturing the video, capture it in the highest resolution possible. For Europeans it's 720x576 and for Americans it's 720x480. Don't bother adjusting the brightness or contrast in the recording monitor, although maxing out the color is useful. Capture it using MJPEG or uncompressed Component Video if possible. If those are too demanding, then capture it using JPEG. RGB should be a last resort.
<p />
Now on the timeline use Settings-&gt;Format to set a YUV colorspace. Drop a Downsample effect on the footage. Set it for
<pre>
    Horizontal:        2
    Horizontal offset: 0
    Vertical:          2
    Vertical offset:   0
     
            red
        x   green
        x   blue
             alpha
</pre>
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Use the <span class="twikiNewLink" style="background : #FFFFCE;"><font color="#0000FF">CameraTool</font><a href="http://www.ftconsult.com/twiki/bin/edit/Cinelerra/CameraTool?topicparent=Cinelerra.AnalogTVCleaning"><sup>?</sup></a></span> to shift the picture up or down a line to remove the most color interference from the image. This is the difference we're looking for:
<p />
cleaning1.png
<p />
If you have vertical blanking information or crawls which constantly change in each frame, block them out with the <span class="twikiNewLink" style="background : #FFFFCE;"><font color="#0000FF">MaskTool</font><a href="http://www.ftconsult.com/twiki/bin/edit/Cinelerra/MaskTool?topicparent=Cinelerra.AnalogTVCleaning"><sup>?</sup></a></span>. This improves compression ratios.
<p />
This is about all you can do without destroying more data than you would naturally lose in compression. The more invasive cleaning techniques involve deinterlacing. 
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-- <a class="twikiLink" href="../Main/AlexFerrer">AlexFerrer</a> - 19 Dec 2003
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