Problem with Copy and Paste

[Stekroes]

Hi There,

I am writing on an ImageJ Plugin, which should create a ImageStack of Rois from an initial image.

My Problem:

The Stack  contained just white images without the Rois.

The Code of my Plugin:

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import ij.IJ;
import ij.ImagePlus;
import ij.ImageStack;
import ij.gui.Roi;
import ij.plugin.filter.PlugInFilter;
import ij.process.ImageProcessor;


public class Copy_Paste implements PlugInFilter {

  ImagePlus imp;
  ImageStack stack = new ImageStack(150, 150);
 
  public int setup(String arg, ImagePlus imp){
   
    if(imp == null) {
     
      return DONE;
     
    }
   
    this.imp = imp;
   
    return DOES_ALL;
   
  }
 
  public void run(ImageProcessor ip){
   
   ImagePlus impTwo;
   
   Roi roi;
   
   for(int i = 0; i < 100; i++){
     
     impTwo = IJ.createImage("", "RGB White", 150, 150, 1);
     
     roi = new Roi(i, i, 100, 100);
     
     imp.setRoi(roi);
     
     imp.copy(false);
     
     impTwo.paste();
     
     stack.addSlice(impTwo.getProcessor());
     
     impTwo = null;
     
   }
   
   new ImagePlus("Objects", stack).show();
   
  }
 
}


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BTW: If you insert impTwo.show() after the line impTwo.paste() then it works, but i don't wanna see every single picture. (It's part of a bigger program and there can be up to 300 rois)

I hope someone knows a solution.

Cheers,

Stephan