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<p class="MsoNormal"><span lang="EN-US">Dear All<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have two vtkImageData which I map to grey and green color using vtkImageMapToWindowLevelColors-></span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">SetOutputFormatToRGBA</span><span lang="EN-US">.
The two LookUps are manually defined like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> tableGreen->SetTableRange(0,256-1);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> tableGreen->Build();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> for(float i=1; i<256; i++)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> tableGreen->SetTableValue(i,0,i/(256-1),0.0,1.0); // Green<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> tableGreen->SetTableValue(0,0.0,0.0,0.0,0.0); // Background<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> tableGrey->SetTableRange(0,256-1);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> tableGrey->Build();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> for(float i=0; i<256; i++)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> tableGrey->SetTableValue(i,i/(256-1),i/(256-1), i/(256-1),1.0); // Grey<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:green"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Using vtkImageBlend I would like to blend both images using different opcity values (0 – 1), but ignoring any black pixel in the green image, by using SetCompoundMode and CompoundThreshold = 0.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt;text-indent:35.4pt;text-autospace:none">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green">m_blend_A->SetInput(0, GreyImage);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> m_blend_A->SetOpacity(0, 0.3);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> m_blend_A->SetInput(1, GreenImage);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> m_blend_A->SetOpacity(1, 0.7);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> m_blend_A->SetBlendModeToCompound();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> m_blend_A->SetCompoundThreshold(0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:green"> m_blend_A->Update();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Whatever I do, the “black” pixels (background) in the green image are still overlayed on the grey image pixels. However, when I turn the threshold to anything other than
0 no pixel at all are pushed trough the blender (neither the green nor the grey image).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Any help would be much appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Thanks - Peter
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE">---------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE">Prof. Dr. Peter Böttcher, DipECVS<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE">European Veterinary Specialist in Surgery
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;mso-fareast-language:DE">Fachtierarzt für Kleintierchirurgie
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;mso-fareast-language:DE">Klinik für Kleintiere
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;mso-fareast-language:DE">Universität Leipzig
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;mso-fareast-language:DE">An den Tierkliniken 23<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE">D-04103 Leipzig (Germany)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE">Tel: +49-341-9738700<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE">Fax: +49-341-9738799<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE">Email:
</span><span style="font-size:9.0pt;mso-fareast-language:DE"><a href="mailto:boettcher@kleintierklinik.uni-leipzig.de"><span lang="EN-US" style="color:blue">boettcher@kleintierklinik.uni-leipzig.de</span></a></span><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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