[Insight-users] Problem in setting pixel values for RGB Image

[Kishore Mosaliganti]

Hi Harish,

You may also want to use a while loop rather than a for-loop which
contains about 7 statements on one line. This is not easy to read nor
debug.

So your code would read:

it1.GoToBegin();
it2.GoToBegin();
it3.GoToBegin();
while ( !it1.IsAtEnd() )
{
  ......
   ++it1;
   ++it2;
   ++it3;
}

Kishore

 Wed, Nov 18, 2009 at 8:19 PM, C.Cagatay Bilgin <bilgic at cs.rpi.edu> wrote:
> Hi Harish,
> you want something like:
> RGBImageType::PixelType pixelValue;
> pixelValue[0] = 255;
> pixelValue[1] = 0;
> pixelValue[2] = 0;
> it3.Set(pixelValue);
> Regards,
> C.Cagatay Bilgin
>
>
> Hi all,
>
> I have created a RGBImage and copied a gray scale image to it. Now I would
> like to set some pixel values in RGBImage to some colors lets say red,
> green, etc.
>
> My code is like this
>
>   /* For RGB Pixels */
>   RGBImageType::Pointer rgbImage = RGBImageType::New();
>   rgbImage->SetRegions( image1->GetRequestedRegion() );
>   rgbImage->CopyInformation( image1 );
>   rgbImage->Allocate();
>   /* Iterate through the images */
>   /* Here image1 and image2 are gray scale MRI images */
>   IteratorType it1( image1, image1->GetRequestedRegion());
>   IteratorType it2( image2, image2->GetRequestedRegion());
>   RGBIteratorType it3( rgbImage, rgbImage->GetRequestedRegion());
>
>   for ( it1.GoToBegin(), it2.GoToBegin(), it3.GoToBegin(); !it1.IsAtEnd() &&
> !it2.IsAtEnd();
>     ++it1, ++it2, ++it3)
>   {
>    /* Find x and y */
>    float x,y;
>    x = it1.Get();
>    y = it2.Get();
>    int val = func(x,y);
>    if(val == 0)
>       it3.Set(RED_COLOR);
>    else
>       it3.Set(GREEN_COLOR);
>   }
>
>
> What should RED_COLOR and GREEN_COLOR be replaced with??
>
> Thanks,
> Harish
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