[vtkusers] HELP! Color scale and Slice display

[Arsene ELLA]

Hi,

1) To build a 256 color lookup table from blue to red, the vtk following 
part of code is use:

-----------------------------------------
:
:
  vtkLookupTable *lut = vtkLookupTable::New();
  lut->SetHueRange(0.66667, 0.0);
  lut->SetSaturationRange(1, 1);
  lut->SetValueRange(1, 1);
  lut->SetAlphaRange(1, 1);
  lut->SetNumberOfColors(256);
  lut->Build();
:
:
-----------------------------------------
How can I change those values to build:
* gray color scale (variation of gray level)?
* gray color scale (from Black to White  throughout variations of red and 
yellow: Black->Red->Yellow->White)?


2) Displaying a 3D image slice (from "C:\\......\Data\\headsq\\quarter") in 
a view
port as following :
----------------------
:
:
vtkImager *imager1;
imager1 = vtkImager::New();
imager1->AddActor2D(actor1);
imager1->SetViewport(0.5, 0.0, 1.0, 0.5);
:
:
----------------------
the slice image appears too small than the view port. How can I do to 
enlarge the
image to fit the view port?


thanks in advance,

Arsene