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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">It looks like this is an old message that has been stuck waiting for a moderator to release it, but in case you are still interested in the answer here goes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">There used to be a parameter in the color map named Scalar Opacity Unit Distance (or something like that) that could be used to uniformly control how opaque the
opacity parameter is interpreted. However, it looks like that option was removed from the GUI quite a while ago (probably because no one understood it). The effect would be a perceived change in the brightness of the volume.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">You can still get around it through the Python interface though. I used that to create the following pair of macros. To load them in ParaView, go to the Macros
-> Add New Macro menu item and load in each file. You can then increase and decrease the brightness of a volume rendering by hitting the two macro buttons.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Sorry for the delay.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Ken<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> ParaView [mailto:paraview-bounces@paraview.org]
<b>On Behalf Of </b>Evan Kao<br>
<b>Sent:</b> Thursday, January 21, 2016 3:02 PM<br>
<b>To:</b> ParaView <paraview@paraview.org><br>
<b>Subject:</b> [EXTERNAL] [Paraview] Volume Rendering "Brightness"<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello all,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">This may be a silly question, but is there a way to increase the brightness of a volume rendering? For instance, in the image below, the render on the right is brighter than the render on the left:<br>
<br>
<img width="530" height="467" id="_x0000_i1025" src="cid:image001.jpg@01D238E4.70512230" alt="Inline image 1"><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">The difference is that the image on the right is just two volume representations of the same object. Is there a smarter way to increase the brightness?<o:p></o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Evan Kao <o:p></o:p></p>
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