[vtk-developers] New vector modes for vtkScalarsToColors

[Arnaud GELAS]

David,

This is something we would need anyway for our project.
So we would be happy to contribute such a feature to VTK!

Where is it developed?
on your github's fork? which branch?

Thanks,
Arnaud

On 03/01/2011 11:10 AM, David Gobbi wrote:
> Yes, the thought has crossed my mind... I've had to work with
> multi-channel images in the past.
>
> These methods could be added to vtkScalarsToColors:
>    SetVectorModeToIndependent()
>    SetLookupTableForChannel(vtkScalarsToColors *colors, int channel)
>
> When in this Independent mode, each component could be mapped through
> one of the "child" lookup tables.  The colors from each channel would
> then be summed and clamped.
>
> If you are willing to add a feature like this, I'll gladly help to get
> it integrated.
>
>   - David
>
>
> On Tue, Mar 1, 2011 at 8:27 AM, Arnaud GELAS
> <arnaud_gelas at hms.harvard.edu>  wrote:
>> David,
>>
>> Currently, in the field of microscopy we can have up to 32 channels
>> (components) images, and for each channel we have an associated color.
>> (Although, most of the time people use less than 6 channels.)
>>
>> Do you think it would be possible to make a more general mode for such color
>> spaces?
>>
>> Arnaud
>>
>> On 02/28/2011 12:39 PM, David Gobbi wrote:
>>> Hi All,
>>>
>>> I'm in the process of adding more VectorModes to vtkScalarsToColors.
>>> Right now it supports:
>>>    Component - map one vector component through the table
>>>    Magnitude - map the vector magnitude through the table
>>>
>>> However, I have to deal with multi-component data that is already
>>> color data.  When I apply a vtkLookupTable, I want it to automatically
>>> treat multi-component data as color data, and only apply the lookup
>>> when it receives single-component data. So I've added the following
>>> vector mode:
>>>    RGBColors - if input is multi-component, convert to unsigned char
>>>
>>> Mathieu has already requested modes for YCbCr and other color
>>> spaces, which vtkScalarsToColors could convert on-the-fly to
>>> RGB.  To me, it makes sense to have all the conversions handled
>>> in vtkScalarsToColors so that they can be shared by the Imaging
>>> and Graphics pipelines.
>>>
>>> Any comments/questions?
>>>
>>>   - David
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>>