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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,<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">Thanks for your reply.<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">But I tried to change the alpha value in the Lookup Table of the first input to 0 and tried to set the opacity value of the 2<sup>nd</sup> input as 1. Then
also the result is coming incorrect(white screen is shown,no output is displayed). The expected result should be that the 1<sup>st</sup> input is perfectly transparent so only 2<sup>nd</sup> input should be shown in the output.<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">First Input LUT(changed the alpha value to 0)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:blue">for</span><span style="font-size:9.5pt;font-family:Consolas"> (<span style="color:blue">int</span> i = 0; i < 4096; i++)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">string</span> str = read.ReadLine();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">string</span>[] value = str.Split(<span style="color:#A31515">','</span>);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">double</span>[] colorValue = <span style="color:blue">new</span>
<span style="color:blue">double</span>[5];<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">for</span> (<span style="color:blue">int</span> j = 0; j < 5; j++)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> colorValue[j] =
<span style="color:#2B91AF">Convert</span>.ToDouble(value[j]);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> table.SetTableValue((<span style="color:blue">long</span>)colorValue[0], colorValue[1], colorValue[2], colorValue[3], 0);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Setting the opacity of second Input<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" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">blend.SetOpacity(1, 1);<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">Can you please explain this behavior?<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Anupriya<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>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Jagjeet Nain [mailto:jagjeet.nain@gmail.com]
<br>
<b>Sent:</b> Monday, October 01, 2012 7:35 PM<br>
<b>To:</b> Sharma, Anupriya<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] Not able to blend properly<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">it works following way:<o:p></o:p></p>
</div>
<p class="MsoNormal">Normal (default) : This is the standard blending mode used by OpenGL and other graphics packages. The output always has the same number of components and the same extent as the first input.
<b>The alpha value of the first input is not used in the blending computation, instead it is copied directly to the output.</b><br>
<br>
output <- input[0]<br>
foreach input i {<br>
foreach pixel px {<br>
r <- input[i](px)(alpha) * opacity[i]<br>
f <- (255 - r)<br>
output(px) <- output(px) * f + input(px) * r<br>
}<br>
}<br>
<br>
Cheers<br>
On Mon, Oct 1, 2012 at 7:40 AM, <<a href="mailto:anupriya.sharma@accenture.com">anupriya.sharma@accenture.com</a>> wrote:<br>
> Hi<br>
><br>
> <br>
><br>
> I am trying to blend two different raw files. I have used vtkImageReader to<br>
> read both the files. I have applied two different lookup tables on both the<br>
> file<br>
><br>
> I have also used vtkImageMapToColors ColorMapper = new<br>
> vtkImageMapToColors();<br>
><br>
> <br>
><br>
> vtkImageMapToColors ColorMapper = new vtkImageMapToColors();<br>
><br>
> ColorMapper.SetInput(reader1.GetOutput());<br>
><br>
> ColorMapper.SetLookupTable(table);<br>
><br>
> <br>
><br>
> vtkImageMapToColors ColorMapper1 = new<br>
> vtkImageMapToColors();<br>
><br>
> ColorMapper1.SetInput(reader2.GetOutput());<br>
><br>
> ColorMapper1.SetLookupTable(table1);<br>
><br>
> <br>
><br>
> “table is the Lookuptable applied on first file and table1 is the lookup<br>
> table applied on second file”.<br>
><br>
> <br>
><br>
> After setting the lookuptable I have created instance of vtkImage blend.<br>
><br>
> <br>
><br>
> vtkImageBlend blend = new vtkImageBlend();<br>
><br>
> blend.setOpacity(0,0);<br>
><br>
> blend.setOpacity(1,0);<br>
><br>
> blend.AddInputConnection(ColorMapper.GetOutputPort);<br>
><br>
> blend.AddInputConnection(ColorMapper1.GetOutputPort);<br>
><br>
> <br>
><br>
> I have later given the output of blend to the Input Connection of Viewer.<br>
><br>
> Viewer.SetInputConnection(blend.GetOutputPort());<br>
><br>
> <br>
><br>
> But the problem is the opacity results are coming incorrect.<br>
><br>
> <br>
><br>
> If the opacity of first file is 0 and the opacity of second file is also 0<br>
> then no output should be displayed but the output is getting displayed with<br>
> color of first LUT i.e Green.<br>
><br>
> If the opacities are 0.5 and 0.5(0.5 opacity for both the files) then the<br>
> fused color (dark green ) is getting displayed. The same color is getting<br>
> displayed at opacities 0 and 0.5(0 for first file and 0.5 for second).The<br>
> same thing is happening with opacities 1 and 0.5(1 for first file and 0.5<br>
> for second).<br>
><br>
> <br>
><br>
> Could anyone please explain how this Opacity function is working and how to<br>
> blend two different files with different color tables.<br>
><br>
> <br>
><br>
> <br>
><br>
> <br>
><br>
> Regards<br>
><br>
> Anupriya Sharma<br>
><br>
> <br>
><br>
><br>
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