[vtkusers] Why so slow to read and view a image?

[zhangzhijun]

Dear vtkers:

I use the following code ot load and view a BMP image. but It's too slow.
for a bmp image of 240*320 it takes more than 6 seconds.And the 
interaction is also slow. what's the reason?it's the same with vtkTIFFReader.
The following is the program:

BOOL CImaDoc::OnOpenDocument(LPCTSTR lpszPathName) 
{
if (!vtkMFCDocument::OnOpenDocument(lpszPathName))
return FALSE;
// TODO: Add your specialized creation code here
this->ImageReader = vtkBMPReader::New();
this->Mapper =vtkDataSetMapper::New();
this->Actor =vtkActor::New();
this->Actor->SetMapper(Mapper);
this->ImageReader->SetFileName(lpszPathName);
this->Mapper->SetInput(this->ImageReader->GetOutput());
this->Props->AddItem(this->Actor);
this->Actor->VisibilityOn();
return TRUE;
}


regards,

zj zhang
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