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</div><div class="twikiRevInfo"><span class="twikiGrayText"><span class="twikiToolbarElem">Cinelerra.VideoHistogram</span><span class="twikiToolbarElem">r1.3 - 16 Jan 2004 - 22:19 - <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="VideoHistogram"> </a> <a class="twikiLink" href="VideoHistogram">VideoHistogram</a> </h3>
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This shows the number of occurances of each value of a certain <span class="twikiNewLink" style="background : #FFFFCE;"><font color="#0000FF">ColorChannel</font><a href="http://www.ftconsult.com/twiki/bin/edit/Cinelerra/ColorChannel?topicparent=Cinelerra.VideoHistogram"><sup>?</sup></a></span>. It is always performed in 16 bit <a class="twikiLink" href="VideoFormats">RGB</a> regardless of the project <span class="twikiNewLink" style="background : #FFFFCE;"><font color="#0000FF">colorspace</font><a href="http://www.ftconsult.com/twiki/bin/edit/Cinelerra/Colorspace?topicparent=Cinelerra.VideoHistogram"><sup>?</sup></a></span>. Use the upper gradient to determine the range of input intensities to be expanded to the output. Use the lower gradient to determine the range of output intensities to target the expansion to. Enable automatic mode to have the histogram calculate automatic input values for every frame. The threshold is only used in automatic mode and determines how sensitive to the upper and lower boundaries of the histogram the automatic gain should be. 
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-- <a class="twikiLink" href="../Main/AlexFerrer">AlexFerrer</a> - 19 Dec 2003
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