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<div><span></span><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;">Dear all </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> I feel confused when display a CT image using VTK. How can I make those black and gray part in the following picture invisible ? </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> The key part of my code is : </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;">vtkSmartPointer<vtkPiecewiseFunction> opacityTransferFunction = vtkSmartPointer<vtkPiecewiseFunction>::New(); </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> opacityTransferFunction->AddPoint(0,1200); </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> opacityTransferFunction->AddPoint(1200,0.4); </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> opacityTransferFunction->AddPoint(2000,0.2); </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> vtkSmartPointer<vtkColorTransferFunction> colorTransferFunction = vtkSmartPointer<vtkColorTransferFunction>::New(); </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> colorTransferFunction->AddRGBPoint(0,0,0.5,0); </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> colorTransferFunction->AddRGBPoint(60,1,0,0); </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"> colorTransferFunction->AddRGBPoint(255,0.8,0.8,0.8); </span></div><div><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><br></span></div><div><img src="cid:_Foxmail.1@f7c875ca-37c8-8895-8f54-dad40a5eb5ab" border="0"></div><div><br></div><div><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;">Thank you in advanced! </span><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><br style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;">ZhangQiang</span></div><div><span style="font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13.4399995803833px; line-height: normal; widows: 1;"><br></span></div>
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