[Insight-users] RGB image to gray Image

[Luis Ibanez]

Hi Pan,

If you read an RGB image using an ImageFileReader<>
that has been instantiated for a GrayScale image, then
the reader will convert RGB to GrayScale for you.


You can also use explicitly the filter

              RGBToLuminanceImageFilter

http://www.itk.org/Insight/Doxygen/html/classitk_1_1RGBToLuminanceImageFilter.html


You can also convert grayscale to RGB but that will be
done by setting the three channels (R,G,B) to the same
value, which is just a replication of memory.  The simple
way to do it would be to write an adaptor following the
examples of the ITK Software Guide.

     http://www.itk.org/ItkSoftwareGuide.pdf

Chapter 12, pdf-page 521-532.



   Please let us know if you have further questions,


      Thanks



         Luis


----------------
Pan Ross wrote:

> Is there a filter to change a RGB image to gray image , and change a 
> gray image to RGB image?
>  
>  
> Thanks
> 
> 
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