[vtkusers] Why is the image red?

[David Gobbi]

The class vtkImageMapToColors can apply a lookup table to a whole
image.  As for vtkTexture, it has a set of rules that control when it
applies a lookup table, just like vtkMapper does.  Really, vtkTexture
is, itself, very much like a mapper.  The rules for how vtkTexture
maps the input data into something that can be used by the hardware
are described in the class documentation.

   David


On Mon, Dec 14, 2009 at 1:53 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Mon, Dec 14, 2009 at 3:26 PM, Jérôme <jerome.velut at gmail.com> wrote:
>> Hi David,
>>
>> Isn't it the default lookup table? 0 (red) to 1 (blue) (with 0.5 is green)?
>>
>> Jerome
>
> Why would it use a lookup table? I am providing it with an image, no?
> How would you make it just use the colors that are in the ImageData as
> it does when you read an image from a jpeg file?
>
> If I do need to use a color lookup table (which hopefully I don't) -
> the only way I know how to use it is for a single value at a time
> (http://www.cmake.org/Wiki/Color_Lookup_Table). Is there a way to
> apply it to a whole image or to the texture mapper or something?
>
> Thanks,
>
> David
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