[vtkusers] How to adjust VTK Image brightness and contrast with QT Slider

[David Doria]

On Fri, Feb 10, 2012 at 1:25 PM, yarram <somasekhar.vit at gmail.com> wrote:

> Hi,
>    I want to control the VTK rendered image brightness and contrast. Please
> help me with the corresponding snippet. I couldn't find any perfect and
> clear post of this kind. Thank you in advance.
>
> Sincerely,
> Yarram (somasekhar.vit at gmail.com)


These are two very separate questions:

1) How do I use a slider widget?
http://programmingexamples.net/wiki/Qt/Widgets/Slider

2) How do I change the brightness and contrast of an image in VTK?
You can use the vtkImageShiftScale filter:
 http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/ImageShiftScale
Shift by brightness, scale by contrast.

3) You'll need to use a QVTKWidget to link the two together:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Qt/RenderWindowUIMultipleInheritance

Good luck,

David
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