[vtkusers] LUT: gray scale to RGB

[Luis Roberto P. Paula]

Thanks Bill, It is working now!!

Regards,
Luis

On Fri, Jul 2, 2010 at 4:28 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:

> Try
> lut->SetRange(0.0, 100.0);
>
>
> On Fri, Jul 2, 2010 at 3:07 PM, Luis Roberto P. Paula <luisrpp at gmail.com>
> wrote:
> > Hi All,
> >
> > I have an image in gray scale. In this image, there are just three
> possible
> > values: 0, 50 and 100.
> >
> > I need to set 50 to red and 100 to green, so I have created the following
> > lookup table:
> >
> >    vtkLookupTable *lut = vtkLookupTable::New();
> >    lut->SetNumberOfColors(101);
> >    lut->SetTableValue(0,0,0,0,0);
> >    lut->SetTableValue(50,1,0,0,1);
> >    lut->SetTableValue(100,0,1,0,1);
> >    lut->Build();
> >
> > And here I'm using converting this image to RGB:
> >
> >    vtkImageMapToColors *img1_rgb = vtkImageMapToColors::New();
> >    img1_rgb->SetInput(img_grey);
> >    img1_rgb->SetLookupTable(lut);
> >    img1_rgb->SetOutputFormatToRGBA();
> >    img1_rgb->Update();
> >
> > The problem is that the pixels with values 50 and 100 are always being
> > converted to green, with the same intensity.
> >
> > Does anyone know what I'm doing wrong?
> >
> > Thanks & Regards,
> > Luis
> >
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